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Published In: Die Natürlichen Pflanzenfamilien 1(3): 1019. 1908. (Nat. Pflanzenfam.) Name publication detailView in Biodiversity Heritage Library

Project Name Data (Last Modified On 3/30/2009)
Acceptance : Accepted
Project Data     (Last Modified On 3/30/2009)
General Reference:

Notes     (Last Modified On 3/30/2009)
general taxon notes:
Actinothuidium has the largest plants in the Thuidiaceae. It is characterized by having erect plants, regularly pinnately branched stems, widely ovate or triangularly ovate leaf bases, papillose branch leaf cells with papillae at upper corners, and the cylindrical capsules. The genus is very close to Hylocomiopsis Card.
Actinothuidium is mainly distributed in Himalayan mountain regions and found in various places of China. The genus used to include two species with Actinothuidium sikkimense Warnst. endemic to Himalayan regions. Recently, Watanabe (1991) reduced the latter species to synonymy of A. hookeri (Mitt.) Broth. This species occurs in northeastern, northwestern and southwestern China as well as Taiwan alpine forest regions.
The genus is also treated under the Helodiaceae.


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2. Actinothuidium (Besch.) Broth. 锦丝藓属 jin-si xian shu
Nat. Pflanzenfam. I(3): 1019. 1908. Thuidium sect. Actinothuidium Besch., Ann. Sci. Nat., Bot., ser. 7, 15: 82. 1891.
Plants very stout, robust, rarely slender, yellowish green to brownish green, somewhat shining, in tufted or large cushions or mats. Primary stems erect, simple, sometimes forked; secondary stems densely pinnately branched; paraphyllia multibranched, dense on stems and branches; rhizoids reddish brown at lower portion of stems, rarely at the apex of branches. Stem leaves and branch leaves more or less polymorphic; stem leaves appressed when dry, widely cordate, gradually narrowed to a lanceolate acumen, deeply plicate, secund above; margins slightly revolute above, remotely dentate; costa thick, vanishing near leaf apex; leaf cells oblong-rhomboidal or oblong-hexagonal, slightly papillose at upper corners; thin-walled, hyaline; branch leaves ovate, with short lanceolate apex. Dioicous. Setae slender, up to 5 cm long; capsules cylindrical, inclined or horizontal, slightly curved; annuli differentiated, caducous when mature; opercula conic; peristome double; exostome teeth narrowly lanceolate, trabeculate below; endostome segments nearly as long as the teeth, lanceolate, pale yellowish, perforated, smooth; basal membrane high; cilia 3, shorter than the segments, smooth, nodulose. Calyptrae not seen. Spores not seen.

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One species is found in China.

1. Actinothuidium hookeri (Mitt.) Broth. 

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