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Macrothamnium M. Fleisch. 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: Hedwigia 44: 307. 1905. (Hedwigia) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

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

Notes     (Last Modified On 4/3/2009)
general taxon notes:
The genus consists of five species in the world, often found in tropical or subtropical regions. Four species are known from China.

 

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6. MacrothamniumFleisch.   南木藓属   nan mu xian shu
Hedwigia 44: 307. 1905.
 
Plants medium-sized to large, dull or slightly glossy, yellowish green or yellowish brown, in loose or dense mats. Main stems elongate and prostrate; secondary stems usually curved, sometimes nearly dendroid, irregularly or regularly 1–3-pinnately branched, central strand poorly developed, consisting of small and thin-walled cells, an inner parenchyma of larger cells with thin walls, and a sterome of small, thick-walled cells, the epidermis usually not differentiated from the sterome, but occasionally with larger, thin-walled and hyaline cells; paraphyllia absent; pseudoparaphyllia triangular or lanceolate; rhizoids on tips of branches and main stems, few. Stem leaves and branch leaves differentiated; stem leaves erect to spreading, cordate, reniform or broadly ovate, obtuse, acute or acuminate at apex, usually cordate at base, decurrent or not decurrent, somewhat concave, occasionally somewhat plicate; margins reflexed at base, serrate above, serrulate below; costae double, 1/4–1/2 the leaf length, sometimes indistinct; median leaf cells narrowly oblong to linear, approximately 5–12:1, smooth or rarely finely papillose, pitted or slightly pitted at base; alar cells not differentiated, or sometimes conspicuously inflated; branch leaves more closely arranged, spreading, rounded ovate or oblong, acute or short-acuminate at apex, not or slightly decurrent; costae weak; laminal cells prorate; alar cells not differentiated. Dioicous. Perichaetia on main stems. Setae elongate, smooth, reddish; capsules erect or slightly inclined, symmetric, usually with a short apophysis, constricted below the mouth or irregularly plicate when dry; exothecial cells isodiametric or rectangular, stomata superficial at base of capsules; annuli consisting of 2–3 rows of small cells, sometimes absent; opercula conic; peristome double; exostome teeth yellow, orange yellow, reddish brown at base, lanceolate, slightly bordered; outer surface irregularly or regularly cross-striate and papillose, rarely perforated along median line; endostome segments yellow, smooth or papillose, narrowly perforated; basal membrane 1/4–1/2 the length of segments; cilia 2–4, nodulose or absent. Calyptrae cucullate, smooth, naked. Spores spherical, finely papillose, 8–33 µm in diameter.
 
 
 
 

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1. Stem leaves conspicuously decurrent at base...............................................................................2
1. Stem leaves usually not decurrent at base....................................................................................3
2. Stem and branch leaves shortly acuminate at apex; in stem cross section epidermal layer usually consisting of thick-walled cells................................................................................................. 1. M. javense
2. Stem and branch leaves acute at apex; in stem cross section epidermal layer usually consisting of a layer of thin-walled cells................................................................................................... 2. M. leptohymenioides
3. Primary stems elongate; secondary stems usually simple; branches rather rigid..........3. M. macrocarpum
3. Primary stems short; secondary stems usually pinnately branched; branches somewhat soft................................................................................4. M. submacrocarpum
 
 
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