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Published In: Novon 18: 344. 2008[2008]. (Novon) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 4/1/2009)
Acceptance : Accepted
Project Data     (Last Modified On 5/6/2009)
General Reference:

Illustration & Map     (Last Modified On 5/6/2009)
Illustrations: Plagiothecium shevockii S. He (Figs. 1–11.)
Map: Plagiothecium shevockii S. He (Distribution in China)

Distribution     (Last Modified On 5/6/2009)
Habitat: on rocks; alt. 3600 m.
Distribution: endemic to China.

Specimens Examined     (Last Modified On 5/6/2009)
Specimens Examined:
Chinese specimens examined: see the type cited above.

Notes     (Last Modified On 5/6/2009)
general taxon notes:


Plagiothecium shevockii resembles P. paleaceum in having similar orbicular leaves, but it differs from the latter by having much stronger double costae and slenderly acute, denticulate leaf apices with a group of differentiated, hyaline, thin-walled cells often bearing rhizoids.


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14. Plagiothecium shevockii S. He   石氏棉藓   shi shi mian xian
Novon 18: 344. 2008. Type: China. Taiwan: Miaoli Co., Shei-Pa Nat. Park, on metamorphic rock underhang, 3600 m, 26 Apr. 1999, Shevock 18109 (holotype MO; isotypes CAS, PE, TAIE, UC).
Plants medium-sized, soft, yellowish green, glossy, in loose mats. Main stems prostrate, to 30 mm long, 4–6 mm wide when wet, secondary stems prostrate or slightly ascending, mostly simple, sometimes shortly branched, with strongly contorted leaves when dry; in cross section outermost layer of stem cells large, thin-walled, central strand weakly differentiated. Stem and branch leaves similar, contorted when dry, distantly spaced, spreading, symmetric, broadly ovate to orbicular at base, 2.8–3.1 mm × 1.8–1.9 mm, abruptly narrowed to a slenderly acute apex; margins plane, often dentate at apex; costae double or forked, ca. 1/3 to 1/2 the leaf length, occasionally appearing single; median leaf cells elongate-rhomboidal, 90–125 µm × 15–18 µm, thin-walled, smooth; apical cells significantly shorter than adjacent cells, 20–30 µm × 12–14 µm, thin-walled, hyaline, often bearing rhizoids on the abaxial surface; basal juxtacostal cells shorter and broader than median cells; alar regions markedly differentiated, with somewhat enlarged, thin-walled, rectangular cells, strongly decurrent with long, narrow stripes along stem in 2–4 rows and 12 cells long. Dioicous? Perichaetial leaves shortly ovate-lanceolate. Sporophytes not seen.
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