Bryocrumia vivicolor (Brotherus & Dixon) W. R. Buck, 1987

Ma, Wen-Zhang, Shevock, James R. & He, Si, 2016, The first discovery on the sporophytes of a rheophytic moss: Bryocrumia vivicolor (Bryophyta, Hypnaceae), Phytotaxa 265 (1), pp. 73-78 : 74-75

Bryocrumia vivicolor (Brotherus & Dixon) W. R. Buck ( Figs. 1 , 2 )

Perichaetial leaves different in size, ecostate. Inner perichaetial leaves 1.0– 1.3 mm long, with a broadly ovate sheathing base, 0.36–0.43 mm wide and gradually narrowed in the middle, ending with a bluntly acute apex, 0.10–0.12 mm wide, strongly twisted when dry. Outer perichaetial leaves 0.70–0.76 mm long, with an indistinct sheathing base, 0.34–0.38 mm wide. Setae (8.4–) 10.7–12.4 (–17.0) mm long, reddish, smooth, slightly twisted when dry, a central strand present. Capsules horizontal to pendulous at maturity, symmetric, ovoid, short-necked, 0.7–1.2 × 0.5–0.6 mm. Operculum conical, short-rostrate, 0.5–0.7 mm long. Annulus not persistent, falling off at maturity, consisting of 1–2 rows of cells. Exothecial cells subquadrate or 5–6 sided polygons, 14.1–18.3 × 8.1–12.0 μm, thin-walled, slightly collenchymatous. Stomata present only at the neck, short-pored, guard cells about 12.6 × 6.2 μm. Exostome teeth in 16 pairs, fused at base, linear-lanceolate, 142–150 μm long, ca. 25 μm wide at base, curved inwardly when dry, yellowish tangerine in the lower 2/3 portion, densely cross-striolate, light-colored above, sparsely papillose at the outer surface. Endostome segments large, nearly as long as exostome teeth, light brown to yellowish, keeled, minutely papillose at the outer surface, basal membrane well-developed, 50–60 μm high. Cilia mostly 2, sometimes 1 or 3 in groups, shorter than segments, ca. 35 μm long, light yellow, fragile. Spores spherical or slightly elliptic, 16–20 μm in diameter, minutely papillose. Calyptra not seen.

Habitat: on rocks, mostly along stream channels, seasonally (irregularly) submerged, alt. 800–2670 m.

Specimens examined with sporophytes (collected between May–October, 2015): CHINA. Yunnan: Dali Region, Yang-Bi County, Ma & Shevock 15-6357 (CAS, KUN). Honghe Region, Jin-Ping County, Ma 15-7067 (CAS, KUN); Shevock 47812 (CAS, KUN). Lincang Region, Cang-Yuan County, Ma & Shevock 15-6855 (CAS, KUN); Shevock & Ma 47532 (CAS, H, KUN, MO, NY, SZG).

Other specimens examined (collected between July 1998 and September 2015): CHINA. Yunnan: Baoshan Region, Long-Yang District, Shevock 27343 ( CAS, E, KUN, MO) ; Teng-Chong County, Long 32748 ( CAS, E, KUN, MO), Ma 15-6324 ( CAS, KUN). Dali Region, Yang-Bi County, Redfearn & Su 971 ( CAS, DUKE, KUN, MO). Honghe Region , Lv-Chun Co. , Ma 15-6987, 15-6997, 15-7005 (all in CAS, KUN). Lincang Region , Geng-Ma County, Ma & Shevock 15-6830 ( CAS, KUN). Nujiang Region , Fu-Gong County , Ma 13-5184 ( CAS, KUN) ; Gong-Shan County, Long 36207 ( CAS, E, KUN, MO). Yuxi Region, Xin-Ping County , Ma & Shevock 15-6760 ( CAS, KUN, UC), Ma & Shevock 15-6762 ( CAS, KUN) .

Figures

FIGURE 1. Plants and perichaetial leaves of Bryocrumia vivicolor: A. Plants with capsule. B. Young leaves on branch. C. Mature leaf. D. Outer perichaetial leaf. E. Middle perichaetial leaf. F. Inner perichaetial leaf. A–C from Ma 15-7067; D–F from Shevock 47812; G from Redfearn 971. Scale bars: a for A, b for B, c for C–F, d for G.

FIGURE 2. A. Exostome. B. Endostome. C. Stoma at capsule neck. D. Exothecial cells. E. Cross section of seta. F. Annuli attached on operculum.A–D & F from Ma 15-7067, E from Shevock 47812. Scale bar for A–F.