• Korean Journal of Plant Taxonomy
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• v.35 no.4
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• pp.247-272
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• 2005

The Philadelphus schrenkii complex including P. schrenkii var. schrenkii, P. schrenkii var. jackii, P. schrenkii var. mandshuricus, P. tenuifolius, P. pekinensis, P. seoulensis, P. lasiogynus, and P. scaber, is distributed in China, Korea, japan, and far eastern Russia. Their taxonomic delimitations are obscure because quantitative characters, such as presence/absence and density of hair on leaf, petiole, style, disc, calyx-tube, and pedicel, are highly variable with no apparent characteristics that consistently distinguish from each other within the group. Thus, these morphological characters are reexamined using univariate analyses. P. pekinenesis is distinct from other taxa in having glabrous disk, calyx, pedicel, and leaf blade. In addition, the number of flowers in an inflorescence [(5)7-9(11) vs 5-7 in other taxa], smaller calyx tube [2.5-3 mm vs. (2.5)3-4(5.9) in other taxa], and slightly divided styles help distinguish P. pekinenesis from other related taxa in Korea. However, P. schrenkii var. schrenkii, P. schrenkii var. jackii, P. schrenkii var. mandshuricus, and P. lasiogynus show continuous variation in the pubescence of disk, calyx, pedicel, and leaf blade, and this may reflect a lack of divergence among them. Particular emphases are placed on P. tenuifolius and P. seoulensis, because of the high degree of morphological intergradation with respect to the degree of pubescence in disk, calyx, pedicel, and leaf blade and their inconsistent circumscription across various systematic treatments. P. scaber, distributed in the southern Korea, has often been treated as an independent species having exfoliated branchlets, distinct serrated leaf margin, and recurved styles. However, this current study suggests that P. scaber should be recognized as a form of P. tenuifolius because these distinguishing characters are continuous between P. tenuifolius and P. scaber. In geographical distribution, P. pekinensis is mainly distributed in the southern part of Korea, while P. tenuifoilus and P. schrenkii are commonly found all over the country.

• Parasites, Hosts and Diseases
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• v.28 no.4
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• pp.235-240
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• 1990

During an investigation on intestinal flukes of house rats in Yangyang-gun, Kangwon-do, a total of 6 species of trematodes belonging to 3 families; Echinostom-atidae (Echinostoma hortense, E. cinetorchis, E. revolutum and Echinoparyphium recurvatum), Diplostomidae (Fibricoza seoulensis) and Plagiorchiidae (Plagiorchis muris), were recovered from two adult rats. E. revolutum and E. recurvatum were new trematode faunae of rats in Korea. 5. revolutum had an elongated body, 5.3∼6.Omm long and 1.0∼1.3mm wide. The total number of collar spines was 35∼37 including 5 end group ones on each ventral corner. Its coiled uterus contained numerous eggs.5. recurvatum also had an elongated body, 3.5∼4.7 mm long and 0.50∼0.65 mm wide. It had total 45 collar spines including 4 end group ones. The uterus toras short with only a few eggs. It has been first confirmed by this study that E. revolutum and E. recurvatum are indigenously distributed among house rats in Korea. Kef lords: Echinostoma revolutum, Echinoparyphium recurvatum. new fauna. house rats, Yangyang-gun ( Kangwon-do )

• Parasites, Hosts and Diseases
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• v.23 no.1
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• pp.58-72
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• 1985

A histopathological study was carried out on the duodenum of mice and rats experimentally infected by F. seoulensis. Each mouse was infected with 500 metacercariae and killed after 1, 2, 3 days, 1 and 2 weeks from infection. Each rat was given 1, 000 metacercariae and was examined after 1, 2 and 4 weeks from infection. The duodenal tissue sections of mice and rats were stained with hematoxylin eosin, and PAS stained for the rats of 1 week group. The pathological findings are summarized as below. 1. There were no differences in mucosal findings between the mice and the rats, and between the location of duodenum, 1 and 5 em distal to the pylorus. 2. Each worm embraced a villus exclusively with its foliate fore body which was inserted into the intervillous spaces. The fluke pinched villous epithelia using its oral and ventral suckers. The tribocytic organ destroyed the villous epithelia deeply up to the stroma after 3 days from infection. 3. Apparent villous changes were observed in the mice after 3 days from infection. Villous changes were shortening, widening, blunting or fusion. The villous stroma showed edema, microscopic hemorrhage, capillary congestion, dilatation of lymphatics and inflammatory cell infiltration. The cells were lymphocytes, plasma cells, eosinophils and giant cells. Rarely submucosal and trans:nural inflammation was encountered.

• Parasites, Hosts and Diseases
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• v.31 no.4
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• pp.301-314
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• 1993

An electron microscopic study was performed to observe the ultrastructure of the tegument of U seoulensis. The outer surface of the tegument was covered with a tnlaminated plasma membrane. The electron-dense cytoplasmic layer was $2.5{\;}\mu\textrm{m}$ wide In the anterior portion and contained numerous vacuoles, mitochondriae and granular materials in its matrix. The basement layer was 330 nm wade or so, and Its numerous extensions protruded into the cytoplasmic layer. The sensory organ was composed of a small vesicle of $1.7{\;}{\times}{\;}1.1{\;}\mu\textrm{m}$ in dimensions, which possessed a cilium of $1.2{\;}{\times}{\;}0.19{\;}\mu\textrm{m}$ in size. The pharynx was composed of the epithelial layer of about $0.5{\;}\mu\textrm{m}$ wide, well developed muscle layer and basement layer. The tegument of the oral sucker was composed of a cytoplasmic layer of $0.4-0.5{\;}\mu\textrm{m}$ width, a narrow basement layer, a well developed muscle layer and tegumental cells. Some kinds of secretory granules that seemed to be originated from the cells of the oral sucker were observed In the parenchymal portions of the adjacent cells. The tribocytic organ consisted of numerous microvilli. The microvilli were 5 nm wide and heptalaminated. Two types of secretory granules originated from the gland cells of tribocytic organ were observed In the tegument and parenchyme. The tegumental cells were irregular in shape, and of which nuclei were multifarious.

• Parasites, Hosts and Diseases
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• v.24 no.2
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• pp.213-215
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• 1986

Total of 2,643 Korean soldiers were examined of their stool for parasitic infections by both cellophane thick smear and formalin-ether concentration techniques from August, 1983 to December, 1985. Out of them, 73.6% were free from any parasite, 22.6% were ova positive and 4.0% cyst positive. The ova positive rates by species were Ascaris lumbricoides 2.0%, Trichuris trichiura 13.0%, hookworm and Trichostrongylus orientalis 0.08% respectively, Clonorchis sinensis 7.6%, Metagonimus yokogawai 1.1%, Paragonimus westermani 0.08%, Echinostoma hortense 0.04%, Fibricola seoulensis 0.9%, Taenia sp. 0.3%, Hymenolepis nana 0.2% and H. diminuta 0.04%. Most of them (87.3%) were positive by a species, 11.9% by two and 0.8% by 3 species. The cyst positive rates were Entamoeba histolytica 0.6%, E. coli 1.4%, Endolimax nana 1.7%, Iodoamoeba butschlii 0.04% and Giardia lamblia 0.9%. Among the cyst positives, 89.5% were positive by a species, 7.6% by two and 0.5% by 3 species. The intestinal parasite infections among the Korean soldiers decreased distinctly compared with previous data.

• Korean Journal of Plant Resources
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• v.17 no.2
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• pp.122-134
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• 2004

This study was carried out to investigate the resource plants of Mt. Midong. The resource plant of Mt. Midong was surveyed from March, 2002 to October, 2003. In the result of survey, the vascular plant species in Mt. Midong were summarized as 400 taxa; 85 families, 266 genera, 349 species, 48 varieties and 3 forms. And in the results of survey on resource plants among 400 taxa, we confirmed 162 taxa of ornamental plants(40.5％), 250 taxa of edible plants(62.5 ％), 257 taxa of medicinal plants(64.3％) and 167 taxa of the others(41.8 ％). The six taxa were recorded in the surveyed sites as the Korean endemic plants; Hytomecon hylomeconoides, Filipendula palmata var. glabra, Ajuga spectabilis, Weigela subsessilis, Cirsium setidens and Saussurea seoulensis. The rare and endangered plants designated by Korea Forestry Service were two taxa; Hylomecon hylomeconoides and Polygonatum stenophyllum.

• Korean Journal of Environment and Ecology
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• v.16 no.4
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• pp.387-403
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• 2003

The vascular plants in Manbokdae-Yeowonjae section of the Baekdudaegan were consisted of 502 taxa; 104 families,305 genus,439 species, 60 varieties, 3 forma. From the floristic point of view, the Baekdudaegan of Manbokdae-Yeowonjae section belongs to the southern province in Korea. The rare and endangered plants designated by Korea Forest Service were Abies koreana, Pedicularis verticillata, Patrinia saniculaefolia, Hololeion maximowiczii, Lilium callolsum, Paeonia obovate, Tricyrtis dizutata and VioEa diamantica, and Cymbidium goeringii. The Korean endemic species were Abies koreana, Patrinia saniculaefolia, Vicia unijuga, Stewartia koreana, Cornus walteri, Weigela subsessilis, Saussurea seoulensis, Tyicyrtis dilatata, Hosta capitata, Clematis trichotoma et at.

• Journal of Species Research
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• v.10 no.2
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• pp.159-163
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• 2021

Saussurea albifolia, a new species, is reported from the Baekdudaegan Mountains. It has distinctive morphological characteristics that distinguish it from other congeneric species of Saussurea in Korea; radical leaves persist or withered till flowering, white tomentose leaf beneath, campanulate involucre with brown-cobwebby hairs, and dark purplish phyllaries with acuminate tips. Saussurea albifolia is a new, endemic species, narrowly restricted to the Korean Peninsula as a consequence of adaptation to alpine or subalpine environments of the Baekdudaegan Area. Among the Korean species of Saussurea, S. gracilis Maxim., S. insularis Kitam., and S. seoulensis Nakai are morphologically similar to S. albifolia by having leaves with white hairs beneath and persistent radical leaves during blooming period. It has been well understood that Saussurea is one of the highly diversified and adaptable groups in Asteraceae and also that the currently recognized species in Korea likely significant underestimates its diversity on the Korean Peninsula.

• Korean Journal of Environment and Ecology
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• v.17 no.2
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• pp.112-122
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• 2003

This study was carried out to offer the raw data for the conservation of plant ecosystem in Chungcheongbuk-do with systematic grasping the vascular plant in Mt. Midong and to establish the accurate countermeasure of conservation on the rare species as well as to restore their habitats. The vascular plant species in Mt. Midong were summarized as 303 taxa; 81 families, 215 genus, 262 species, 38 varieties and 3 forms. The rare plants designated by Korea Forestry Service were two taxa; Polygonatum stenophyllum, Hylomecon hylomeconoides. The nine taxa were recorded in the surveyed sites as the endemic plants; Melandryum seoulense, Hylomecon hylomeconoides, Spiraea prunifolia for. simpliciflora, Filipendula palmata var. glabra, Ajuga spectabilis, Weigela subsessilis, Lonicera coreana, Cirsium setidens and Saussurea seoulensis. And the naturalized plants were twelve taxa; Rumex crispus, Lepidium apetalum, Robinia pseudo-acacia, Tyifolium pratense, Trifolium repens, Hibiscus trionum, Oenothera odorata, Ambrosia artemisifolia var. elatior, Erigeron annuus, Erigeron canadensis, Taraxacum officinale and Sonchus oleraceus.

• Korean Journal of Plant Resources
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• v.19 no.6
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• pp.700-705
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• 2006

Present studies were performed to determine the physiology of seed germination in Viola species native to Korea. Twelve species, 1 variety and 1 form were collected, classified and used as materials: V. collina, V. blandaefomis, V. rosii, V. chaerophylloides, V. phalacrocarpa, V. patrinii, V. mandshurica, V. mandshurica for. albescence, V. seoulensis, V. yedoensis, V. keiskei, V. variegata, V. variegata var. chinensis, and V. verecunda. V. tricolor 'Helen Mount' was also used to compare wild with cultivated species. In order to investigate the effect of temperature on seed germination, seeds stored at $4{\pm}2^{\circ}C$ for 10 months or 4 years were incubated at 10, 15, 20, $25^{\circ}C$ under 16h illumination with 4 replicates per treatment. Seeds which had not germinated at $10^{\circ}C$ were transferred to $30^{\circ}C$ to assess the effect of temperature change in germination. Germination percent and the days of first, 40% and 80% germination were assessed. Capability of seed germination varied with taxon; Species belonging to subsection Patellares had high ability of germination, compared to species in the other subsections, and series Chinensis was the best among subsection Patellares. Species capable of high germination germinated in all temperatures with reasonably high germination rate, but the other species responded sensitively to temperature with different germination patterns. Higher the temperature, shorter the incubation time required for first, 40% and 80% of germination. Therefore, high temperature was effective in almost all species, not only for inducing high rate of germination but also the uniformity of germination. Temperature change from $10^{\circ}C\;to\;30^{\circ}C$ had a positive effect on seed germination.