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Published In: Bryologia Europaea 5: 101 (fasc. 46–47. Mon. 1). 1851. (Bryol. Eur.) Name publication detail
 

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Notes     (Last Modified On 3/27/2009)
general taxon notes:
Numerous bryologists (e.g. Lawton 1957) considered Pseudoleskea to be synonym of Lescuraea. This concept is accepted in this treatment. There are about 39 species of Lescuraea in the world.
 
The first record of Chinese Lescuraea was published by C. Müller (1896) as Pseudoleskea papillarioides C. Müll. (= Leskeella nervosa) from Shaanxi Province. Later, Brotherus (1929) described Pseudoleskea setschwanica Broth. and P. yunnanensis Broth. from Sichuan and Yunnan. Takaki (1955) published Pseudopleuropus morrisonensis Tak. [= Lescuraea morrisonensis (Tak.) Nog.] from Taiwan. For Taiwan, M.-J. Lai (1976) reported three additional species: Lescuraea incurvata (Hedw.) Lawton., L. julacea Besch et Card. [= L. saxicola (B. S. G.) Milde] and L. saxicola (B.S.G.) Milde. P.-C. Chen et al. (1978) listed 6 species of Lescuraea from China, of which L. mutabilis (Brid.) Lindb. ex Hag. was reported new to the country. Lescuraea morrisonensis fo. sichuanensis Y.-F. Wang, R.-L. Hu & Redfearn from Sichuan was synonymized under Actinothuidium. Six species are recognized in the present treatment. Lescuraea morrisonensis (Tak.) Nog. was not treated here because no specimens were available for study.
 
The genus can be divided into two subgenera based on endostome structures: subg. Lescuraea and subg. Pseudoleskea. Lawton (1957) revised the taxa of the genus from Europe and North America. Since subdivisional levels under families and genera are not adopted in this flora, no separate key to subgenera is provided.

 

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1. Lescuraea Bruch & Schimp. in B.S.G. 多毛藓属 duo-mao xian shu
Bryol. Eur. 5: 101. 1851.
Pseudoleskea sect. Lescuraea (Bruch & Schimp. in B.S.G.) Best, Bull. Torrey Bot. Club 27: 233. 1900.
Pseudoleskea Bruch & Schimp. in B.S.G., Bryol. Eur. 5: 147. 1852.
Ishibaea Broth. & Okam., Bot. Mag. (Tokyo) 29: 186. 1915.
 
Plants slender, delicate, bright green to yellowish green, slightly shiny, in mats. Primary stems prostrate, regularly to irregularly sparsely branched; branches with dense leaves, erect or curved, obtuse at tips; paraphyllia few to abundant on stems, sparse on branches, short, filiform or triangularly lanceolate. Stem leaves oblong-ovate, narrowly decurrent at base, acuminate upward; margins plane or recurved, serrate above; costa single, thick, strong, up to or ending below leaf apex, projecting at tips; leaf cells thin-walled, elongate to linear; upper cells often projecting at upper ends on back surfaces; alar cells quadrate to flatly quadrate; branch leaves similar to stem leaves, slightly narrower and smaller, costa more distinctly projecting on the back. Dioicous. Inner perichaetial leaves larger than stem leaves, long-sheathing at base, narrowly acuminate above, entire, costa short. Perigonia on stems or branches. Setae elongate, erect, smooth; capsules erect, symmetric or pendent, asymmetric; annuli differentiated; peristome double; exostome teeth narrowly lanceolate, fused at base, transversely striolate below, smooth or finely papillose; endostome segments membranous, smooth or finely papillose; basal membrane high or low; cilia usually absent; opercula conic, with short and erect rostrum. Spores medium-sized, papillose.
 
 
 

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1. Plants medium-sized to rather large; leaf cells isodiametric or rhomboidal; capsules inclined; endostome segments as long as the teeth, basal membrane high (subg. Pseudoleskea).......................................... 2
1. Plants small; leaf cells long rhomboidal or nearly linear; capsules erect; endostome segments shorter than the teeth, basal membrane low (subg. Lescuraea).............................................................................5
2. Leaves broadly ovate and decurrent at base, acuminate toward apex; branch apices with multi-flagelliform branches; leaf margins plane........................................................................ 5. L. setschwanica
2. Leaves ovate or oblong-ovate and not decurrent at base, lanceolate toward apex; branch apices without flagelliform branches; leaf margins revolute.........................................................................3
3. Leaf margins clearly revolute from base to near leaf apex on both sides; median leaf cells rectangular to oblong-rectangular..........................................................................................6. L. yuennanensis
3. Leaf margins only revolute from base to the midleaf on both sides; median leaf cells oblong-rounded or oblong-rhomboidal..................................................................................................4
4. Median leaf cells oblong-rounded, 10–12 µm long; leaves secund......................................... 1. L. incurvata
4. Median leaf cells oblong-rhomboidal, 15–20 µm long; leaves erect or slightly secund......... 3. L. radicosa
5. Stem leaves ovate-lanceolate, gradually long acuminate toward apex; costa slender; median leaf cells nearly linear, 9–12:1 (length/width).......................................................................................2. L. mutabilis
5. Stem leaves triangular-lanceolate, shortly acute toward apex; costa thick; median leaf cells oblong-rhomboidal, 5–9:1 (length/width).........................................................................4. L. saxicola
 
 
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