Dendroceros japonicus 


Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Anthoceratophyta Anthocerotopsida Dendrocerotales Dendrocerotaceae

Scientific Name: Dendroceros japonicus
Species Authority: Steph.

Assessment Information [top]

Red List Category & Criteria: Endangered B2ab(ii,iii,iv,v) ver 3.1
Year Published: 2012
Date Assessed: 2010-10-19
Assessor(s): IUCN SSC Bryophyte Specialist Group,
Reviewer(s): Gärdenfors, U. & Bergamini, A.
Contributor(s): Furuki, T.
This species although widespread, has a very scattered and extremely fragmented distribution and each area where it occurs is very small and restricted hence the area of occupancy is only about 200 km². The habitat of this species is under threat from human activities and hence there is continuing decline in a number of parameters, and the species has probably disappeared from a few of its known localities.
Previously published Red List assessments:
2000 Vulnerable (VU)

Geographic Range [top]

Range Description: Recorded from Taiwan, central Japan (Honshu, Kyushu, Shikoku, Tokunoshima Island, Yakushima Island, Nansei-shoto (Ryukyu islands) and Ogasawara (Bonin) Islands and Kusaie (Federated States of Micronesia). According to the herbarium in Canberra D. japonicus has also been found on Norfolk Island (Australia) in 1995, however, according to experts on this genus in the region, this is an incorrect identification.
Countries occurrence:
Japan (Honshu, Kyushu, Nansei-shoto, Ogasawara-shoto, Shikoku); Micronesia, Federated States of ; Taiwan, Province of China
Estimated area of occupancy (AOO) - km2: 200
Continuing decline in area of occupancy (AOO): Yes
Extreme fluctuations in area of occupancy (AOO): No
Estimated extent of occurrence (EOO) - km2:
Number of Locations: 50
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: There is a population decrease of this species in Japan because of habitat loss.
Current Population Trend: Decreasing
Additional data:
Continuing decline of mature individuals: Yes
Extreme fluctuations: No Population severely fragmented: Yes
Continuing decline in subpopulations: Yes
Extreme fluctuations in subpopulations: No All individuals in one subpopulation: No

Habitat and Ecology [top]

Habitat and Ecology: Grows on tree-trunks or (more seldom) on rocks in temperate and subtropical evergreen forest.
Systems: Terrestrial
Continuing decline in area, extent and/or quality of habitat: Yes
Generation Length (years): 20

Threats [top]

Major Threat(s): Threatened by deforestation and forest degradation. The local range in Japan has decreased considerably through the destruction of its habitat. Several human activities are disturbing the existing humidity and light which are both potentially damaging to this species. It has been recorded in 11 prefectures in Japan, however. Dr. T. Furuki (pers. comm.) could not confirm its growth in two prefectures when he was preparing the account of this species for the Japanese Plants Red Data Book.

Conservation Actions [top]

Conservation Actions: The species is listed in Japan as CR/EN (in 2007) and hopefully some conservation actions will be undertaken to prevent this species from becoming extinct in Japan.

Citation: IUCN SSC Bryophyte Specialist Group,. 2012. Dendroceros japonicus. The IUCN Red List of Threatened Species 2012: e.T39218A2893386. . Downloaded on 02 December 2015.
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