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Hylocomiastrum M. Fleisch. ex Broth. Search in The Plant ListSearch in Index Nominum Genericorum (ING)Search in NYBG Virtual HerbariumSearch in JSTOR Plant ScienceSearch in SEINetSearch in African Plants Database at Geneva Botanical Garden Decrease font Increase font Restore font
 

Published In: Die natürlichen Pflanzenfamilien, Zweite Auflage 11: 486–487. 1925. (Nat. Pflanzenfam. (ed. 2)) Name publication detail
 

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Notes     (Last Modified On 4/3/2009)
general taxon notes:
The genus includes three species in the world, and all of them are known from China. Hylocomiastrumis similar to Hylocomium, but differs from the latter by the diverse branching patterns, developed central strand, forked paraphyllia, strongly plicate leaves, a single costa ending a spine, smooth leaf cells, and narrowly perforated endostome segments.
 
 

 

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1. HylocomiastrumFleisch. ex Broth.   星塔藓属   xing ta xian shu
Nat. Pflanzenfam. (ed. 2), 11: 486. 1925.
 
Plants medium-sized to large, dull or sometimes slightly glossy, green, yellowish green to brownish green, loose weft. Main stems prostrate; in cross section a small central strand present; cortical cells thin-walled, parenchyma; outer sterome cells small, thick-walled; secondary stems usually erect-spreading, irregularly or regularly 1–2-pinnately branched; paraphyllia dense on stems and branches, sometimes on the base of leaf and costae, often branched, yellowish brown at base, consisting of multiseriate cells, usually biseriate cells above, cell ends often projecting outward from the margins as spines; pseudoparaphyllia similar to paraphyllia, but larger, or lanceolate with toothed margins; rhizoids occasionally on tip of attenuate branches. Stem leaves and branch leaves somewhat differentiated; stem leaves remotely located, erect-spreading or spreading, broadly rounded ovate, ovate-triangular, usually acuminate above, but proximal leaves often rounded apiculate, acute or abruptly short-acuminate, not or slightly decurrent, somewhat concave, strongly plicate; basal margins reflexed, rarely plane, spinulose-serrate above, serrulate to serrate below, proximal leaves sometimes serrulate to nearly entire throughout; costae strong, single, double or occasionally triple, reaching 1/3 to 3/4 the leaf length, sometimes absent or short and double in proximal leaves, rarely ending in a sharp spine; median cells narrowly oblong or vermiform, approximately 6–12:1, smooth, somewhat thick-walled; basal cells becoming wider, orange yellow, thick-walled, pitted; alar cells not differentiated; branch leaves spreading, broadly rounded ovate or ovate-lanceolate, acute to acuminate, sometimes twisted at tips, concave, plicate; margins serrate above, serrulate below; costae single, up to 1/2–3/4 the leaf length, sometimes forked near ends. Dioicous. Perichaetia on main stems. Setae elongate, yellow or reddish, smooth, twisted below; capsules inclined to horizontal, asymmetric, ovoid, lacking a distinct neck, brown or reddish brown, not plicate or constricted below the mouth; exothecial cells isodiametric or oblong, somewhat thick-walled; stomata superficial at base of capsules; annuli not differentiated; opercula conic-apiculate; peristome double; exostome teeth yellow, lanceolate, often slightly bordered; outer surface irregularly cross-striate, finely papillose above; endostome segments lanceolate, as high as the teeth, light yellowish, papillose, nearly smooth below, trabeculate; basal membrane as high as 1/2 the length of endostome segments, perforated along median line; cilia 1–3, nodulose. Calyptrae cucullate, smooth, naked. Spores globose, 11–20 µm in diameter, finely papillose or nearly smooth.
 

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1. Stem leaves double costate or costae forked.........................................................3. H. umbratum
1. Stem leaves single costate............................................................................................................2
2. Stem leaves triangular or cordate; branch leaves broadly ovate, acute; costa strong..... 1. H. himalayanum
2. Stem and branch leaves broadly ovate-lanceolate; costa slender..............................2. H. pyrenaicum
 
 
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