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Isopterygium Mitt. 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
 

Publicado en: Journal of the Linnean Society, Botany 12: 21, 497–500. 1869. (J. Linn. Soc., Bot.) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Datos del Proyecto Nombre (Last Modified On 4/2/2009)
Aceptación : Accepted
Datos del Proyecto     (Last Modified On 4/2/2009)
General Reference:

Notas     (Last Modified On 4/2/2009)
general taxon notes:
Isopterygium consists of some 170 species in the world. They often occur on rotten wood, tree bases or trunks, rarely on rocks. There are 14 species reported from China (Redfearn et al. 1996); and eight species are treated in this flora.

 

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16. Isopterygium Mitt.    同叶藓属   tong ye xian shu
J. Linn. Soc., Bot. 12: 21. 1869.
 
Plants small to medium-sized. Stems prostrate, radiculose at base, irregularly branched; in stem cross section epidermal cells small, thick-walled; central strand somewhat developed; pseudoparaphyllia filamentous. Stem leaves and branch leaves similar, oblong-ovate, oblong- or ovate-lanceolate, not decurrent, acuminate or suddenly acute, dorsal, ventral leaves symmetric, lateral leaves more or less asymmetric; margins plane, serrulate above or entire; costae indistinct, very short or absent; median leaf cells linear, thin-walled, lower cells shorter; alar cells not differentiated. Brood bodies often present. Autoicous or dioicous. Inner perichaetial leaves oblong-lanceolate, straight. Setae erect, smooth; capsules suberect to horizontal, oblong-ovoid, often with long neck; opercula conic, shortly rostrate; annuli not seen; peristome double; exostome teeth fused at base, outer surface distinctly cross-striate below, papillose, hyaline above, usually bordered, inner surface trabeculate; endostome segments keeled, papillose, not perforate, basal membrane high, cilia 1–2(–3). Calyptrae cucullate, smooth. Spores small, smooth or minutely papillose.
 
 
 

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1. Stems with gemmae-bearing branches...............................................................5. I. propaguliferum
1. Stems without gemmae-bearing branches........................................................................................2
2. Plants dioicous...............................................................................................................................3
2. Plants autoicous.............................................................................................................................6
3. Plants often whitish to silver white....................................................................................................4
3. Plants green, not silver white..........................................................................................................5
4. Leaves ca. 1.2 mm long, more or less symmetric, ovate to oblong-ovate, leaf apices acuminate to long-acuminate, margins nearly entire.......................................................................1. I. albescens
4. Leaves ca. 0.6 mm long, asymmetric, rounded ovate, leaf apices acute, margins serrulate....3. I. courtoisii
5. Stems irregularly branched; stem leaves ca. 1.35 mm long, ovate-lanceolate, acuminate at apex; leaf margins serrulate; setae ca. 2 cm long...............................................................7. I. serrulatum
5. Stems nearly pinnately branched, stem leaves ca. 1 mm long, triangular-lanceolate, shortly acuminate at apex; leaf margins entire or crenulate; setae 1.2–1.4 cm long............................... 6. I. saxense
6. Plants slender, delicate, densely and regularly pinnately branched; leaves symmetrical, triangular-lanceolate, slenderly acuminate; leaf margins entire..................................................... 4. I. minutirameum
6. Plants relatively large, remotely or subpinnately branched; leaves asymmetrical, rounded ovate or oblong-lanceolate, acuminate or acute to mucronate; leaf margins serrulate above or entire................. 7
7. Leaves complanately arranged; setae up to 1.2 cm long.............................................2. I. bancanum
7. Leaves erect-spreading, often falcate-secund; setae 0.8–2.0 cm long........................ 8. I. tenerum
 

 

 
 
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