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Published In: Journal of the Hattori Botanical Laboratory 71: 69. 1992. (J. Hattori Bot. Lab.) Name publication detail

Project Name Data (Last Modified On 3/16/2009)
Acceptance : Accepted
Project Data     (Last Modified On 3/16/2009)
General Reference:

Illustration & Map     (Last Modified On 3/16/2009)
Related Objects:
Illustrations: T. Cao, C. Gao & J.-C. Zhao 1992 (Figs. 1, 2).
Click here for distribution map.
Map: Schistidium chenii (S.H. Lin) T. Cao, C. Gao & J.C. Zhao (Distribution in China)

Distribution     (Last Modified On 3/16/2009)
Habitat: on wet or moist rocks near streams or near glaciers; alt. 3100–5450 m.
Distribution: endemic to China.

Specimens Examined     (Last Modified On 3/16/2009)
Specimens Examined:
Specimens examined: Xinjiang: Fu-kang Co., Mt. Bogeda, J.-C. Zhao & J. Wang 2432 (IFSBH, XJU). Xizang: see the type information cited above.

Notes     (Last Modified On 3/16/2009)
general taxon notes:
Schistidium chenii is distinguished from other species of Schistidium by having strongly concave, cucullate, and broadly ovate leaves with rounded-obtuse to muticous apices, slender costa, ending below the apex, and rounded-quadrate upper and median leaf cells.
P.-C. Chen (1962) published this species as Grimmia himalayana, a later homonym of Grimmia himalayana Mitt. (J. Proc. Linn. Soc., Bot., Suppl. 1: 45. 1859). It was later treated as Grimmia chenii by S.-H. Lin (1984). The species was described as having immersed capsules and a single peristome. However, we did not see any sporophytes in the type specimen deposited in PE. A recent collection from Xinjiang contains numerous mature sporophytes from which we have observed several distinct sporophytic features as illustrated in the figures. This species was transferred from Grimmia to Schistidium based on the opercula falling with columella attached. P.-C. Chen (1963) placed Grimmia himalayana in section Schistidium under Grimmia. Gametophytically, Schistidium chenii is superficially similar to Grimmia mollis Bruch & Schimp., which grows in a similar habitat. The two species differ from each other by the immersed capsules and opercula falling with columella attached in Schistidium chenii and by the exserted capsules and opercula falling without columella attached in Grimmia mollis.


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2. Schistidium chenii (S.-H. Lin) T. Cao, C. Gao & J.-C. Zhao   陈氏连轴藓   chen-shi lian-zhou xian
J. Hattori Bot. Lab. 71: 69. 1992. Grimmia chenii S.-H. Lin, Biol. Bull. Dept. Biol. Coll. Sci. Tunghai Univ. 60: 747. 1984. Grimmia himalayana P.-C. Chen, Zhumulangma Feng Diqu Kexue Kaocha Baogao 227. 1962, nom. illeg. Type. China: Xizang (Tibet), Mt. Qomolangma, alt. 5450 m, VII 9, 1959, Xizang Exped. Team Botanical Group 86 (holotype PE).
Plants medium-sized, 1.5–2.0 cm high, dark green above, brownish green to brown below, in loose tufts. Stems erect, usually with numerous rhizoids at base, frequently branched from innovations, with well developed central strand in cross section. Leaves erect, imbricate, not contorted when dry, erect-spreading when moist, broadly ovate, strongly concave and cucullate, 1.6–2.8 mm long, rounded-obtuse to muticous at apex; margins incurved, bistratose above; costa single, slender, ending below the apex, consisting of nearly homogeneous, thin-walled cells in cross section; upper and median cells unistratose or in places bistratose, rounded-quadrate, 8–12 µm wide, thin-walled; basal marginal cells subquadrate to short-rectangular, 10–13 µm × 9–10 µm, thin-walled; basal juxtacostal cells rectangular, 13–26 µm × 8–10 µm, with thin or somewhat incrassate walls. Autoicous. Perichaetial leaves larger than stem leaves. Setae shorter than capsules, 0.4–0.5 mm long, straight; capsules immersed in perichaetial leaves, broadly ovoid, erect, 1.3–1.5 mm long, wide-mouthed after dehiscence; annuli absent; opercula with short, obtuse beaks, falling with columella attached; peristome single, teeth short, lanceolate, reddish brown, strongly perforate and papillose above, densely papillose in regular rows below. Calyptrae not seen. Spores yellowish brown, 11–13 µm in diameter, granulose.
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