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Published In: Orthomniopsis und Okamuraea, zwei neue Laubmoosgattungen aus Japan 2. 1906. (Orthomniopsis und Okamuraea) Name publication detail
 

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general taxon notes:
Three species and one variety of Okamuraea were recorded in China. Ando (1964) first reported O. hakoniensis var. ussuriensis (Broth.) Nog. from Jilin province. C. Gao (1977) reported O. brachydictyon, O. hakoniensis, O. hakoniensis var. ussuriensis, O. hakoniensis fo. multiflagellifera from northeastern China. Later, C. Gao (1985) reported O. brachydictyon from Xizang. Recently, S.-H. Lin & C.-K. Wang (1977) confirmed the distribution of O. brevipes Broth. in mainland China, although its distinction from O. hakoniensis is based only on the sporophyte characters, i.e. short setae (only 3–5 mm long) and subspherical capsules. Since no sporophyte of O. brevipes was seen by us, this species is not included in this treatment.
 
There are different views about the systematic status of this genus. When established, Okamuraeawas compared to Forsstroemia Lindb. (Brotherus 1906) and was placed in the Brachytheciaceae of the Isobryales (Brotherus 1907). Later, Brotherus (1925) considered the genus to be close to Lesquereuxia and placed both genera in the Rhytidiaceae, which was followed by P.-C. Chen et al. (1978). Andrews (1954) disagreed with this later placement and thought that the genus should be placed in the Meteoriaceae because of the combinations of the following characters: the pilosus calyptrae, the leaf shape and cells, branching patterns, capsule shape and growth position. All these features pointed the genus to the Meteoriaceae. There are other opinions considering the genus to be close to Homalothecium and placing it in the Brachytheciaceae.
 

 

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5. Okamuraea Broth. 褶藓属 zhe xian shu
Öfvers. Förh. Finska Vetensk.-Soc. 49(10): 2. 1906.
Rigodiopsis Dix. & Thér., Rev. Bryol., n. ser. 4: 155. 1933.
 
Plants green to yellowish green, slightly shiny, in mats. Primary stems creeping, with fascicular rhizoids; irregularly or fascicularly branched; branches rather dense, erect or curved, rounded, acuminate at tips, sometimes flagelliform. Leaves loosely appressed on stems when dry, spreading when moist, ovate-lanceolate, concave, slightly decurrent, plicate at base, with an acuminate apex; margins entire, recurved at base; costa single, slender to rather thick, reaching to the middle of leaf; leaf cells rhomboidal or oblong-rhomboidal, slightly thick-walled, smooth; alar cells usually subquadrate. Dioicous. Inner perichaetial leaves smaller than stem leaves, sheathing at base, suddenly narrowed to an acuminate apex. Setae elongate, erect, reddish, smooth; capsules erect or slightly pendent, oblong-ovoid, mouth not contracted; annuli not differentiated; peristome double; exostome teeth 16, narrowly lanceolate, usually fused at base, not striate on outer surfaces, borders differentiated at both sides, densely papillose; endostome segments reduced, hyaline, finely papillose; basal membrane high; cilia lacking; opercula short, rostrate. Calyptrae with sparse hairs. Spores ovoid, densely verrucose.
 

 

 

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1. Plants with short branches; branch apices obtuse at apex and with gemmae or innovations; leaves ovate at base, acuminate at apex....................................................................................1. O. brachydictyon
1. Plants with long branches; branches often flagelliform and attenuate at apex; leaves ovate-lanceolate at base, slenderly acuminate at apex.........................................................................2. O. hakoniensis

 

 
 
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