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Hylocomiaceae M. Fleisch. Search in NYBG Virtual Herbarium Decrease font Increase font Restore font
 

Published In: Nova Guinea 12(2): 125. 1914. (Nova Guinea) Name publication detailView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 2/20/2009)
Acceptance : Accepted
Project Data     (Last Modified On 4/3/2009)
General Reference:

Notes     (Last Modified On 4/3/2009)
general taxon notes:

 

According to Rohrer (1985), the family consists of 12 genera and some 25 species, mostly found on the forest ground from temperate in subalpine regions.

 

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Hylocomiaceae
塔藓科   ta xian ke
by Jia Yu, Wang Mei-zhi, and Wang You-fang
 
 
Plants medium-sized to large, stiff, robust, rarely slender, green, yellowish green to yellow, often slightly glossy, in loose or dense wefts. Stems prostrate, sometimes reddish; secondary stems usually erect-spreading, sometimes arcuate-curved, irregularly branched or regularly 2–3 pinnately branched, usually exhibiting a sympodial or monopodial growth pattern; in cross section a central strand present, with large parenchyma and small epidermis cells; branched paraphyllia or foliose pseudoparaphyllia often present on stems and branches, paraphyllia lacking in some genera and species; rhizoids usually brownish. Leaves in several ranks, spirally imbricate-arranged; stem leaves usually differentiated from branch leaves, erect-spreading, squarrose-recurved or falcate-secund, clasping at base; ovate-lanceolate, broadly lanceolate or triangularly cordate, sometimes plicate or rugose, rarely concave, acuminate, acute to obtuse; upper leaf margins usually toothed, sometimes slightly reflexed at base; costae single, double or irregularly forked, strong or weak, extending to the middle of leaf or vanishing below the middle, rarely absent; laminal cells linear or elongate-vermiform, length and width approximately 5–16:1, smooth, papillose or prorate at back, slightly incrassate or thin-walled; basal cells slightly broad, sometimes yellowish, slightly pitted; alar cells differentiated, usually short, quadrate or subquadrate. Dioicous. Perigonia bud-like, scattered on stems and branches. Perichaetia restricted on the stems, perichaetial leaves usually not plicate, costae double, short, inner perichaetial not costate. Setae elongate, brownish red, smooth; capsules ovoid or elongate-ovoid, suberect to horizontal or pendent; apophyses rarely present; exothecial cells sometimes slightly incrassate, stomata superficial, present at base; annuli of 1–3 rows of differentiated cells or absent; opercula shortly conic, rostrate; peristome double; exostome teeth deeply colored, narrowly lanceolate, lightly bordered; outer surface cross-striate, usually finely and densely papillose; endostome segments lanceolate, light yellow; basal membrane high, usually smooth, trabeculate, perforated along median line; cilia 1–4, sometimes absent. Calyptrae cucullate, smooth. Spores spherical, 8–25 µm in diameter, rarely up to 50 µm, yellowish, finely papillose or nearly smooth.
 

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1. Paraphyllia present......................................................................................................................2
1. Paraphyllia absent.......................................................................................................................4
2. Stem leaves strongly plicate; branch leaves with a single costa extending 1/2 to 3/4 the leaf length and usually ending in a spine......................................................................1. Hylocomiastrum
2. Stem leaves not plicate or rarely lightly plicate; branch leaves with double costae or costa nearly absent 3
3. Secondary stems closely and regularly 2–3-pinnately branched; central strand absent; leaf cells prorate; branches of paraphyllia consisting of 2 rows of cells................................2. Hylocomium
3. Secondary stems irregularly branched to irregularly pinnately branched; central strand present; leaf cells smooth; branches of paraphyllia consisting of several rows of cells..................5. Loeskeobryum
4. Leaf apices usually rounded or obtuse.............................................................................................5
4. Leaf apices usually not rounded......................................................................................................6
5. Plants irregularly branched; branch apices caudate; leaves oblong-ovate, conspicuously concave; costae double, short or weak; alar cells reddish brown, conspicuously differentiated.......................... 8. Pleurozium
5. Plants usually pinnately branched; branch apices not caudate; leaves broadly cordate or triangular, not concave or only slightly concave; costa single, strong, double or absent; alar cells not conspicuously differentiated...........................................................................................................7. Neodolichomitra
6. Stem leaves strongly rugose, falcate; costa of stems and branches long and single............... 10. Rhytidium
6. Stem leaves not strongly rugose, sometimes only falcate at apex; costae of stems and branches not single, but not similar in length..................................................................................................................7
7. Plants large; stem leaves densely arranged, large, usually more than 1 mm wide.............................8
7. Plants rather small; stem leaves loosely arranged, small, usually less than 0.8 mm wide.......................9
8. Stem leaves cordate, with short apices.....................................................................6. Macrothamnium
8. Stem leaves ovate-lanceolate or triangular-lanceolate, with long apices........................9. Rhytidiadelphus
9. Stem leaves wider at the base, conspicuously long-decurrent.....................................3. Leptocladiella
9. Stem leaves wider at the middle, usually not long-decurrent........................................4. Leptohymenium
 
 
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