Oligotrichum obtusatum Broth.

Zhao, Wei, Wang, Zhaoming, Zheng, Lina, Naren, Gaowa, He, Qiang & Han, Wei, 2024, A step forward in botanical exploration with three new Polytrichaceae records from Tibet, China, Biodiversity Data Journal 12, pp. e 133971-e 133971 : e133971-

Oligotrichum obtusatum Broth.

Materials

Type status: Other material. Occurrence: catalogNumber: PE 2155874 ; recordNumber: 12176; recordedBy: Q. He; occurrenceID: D9CB2D58-4FEC-5582-940F-61363733E69C; Taxon: order: Polytrichales ; family: Polytrichaceae ; genus: Oligotrichum ; Location: continent: Asia; country: China; countryCode: China / CN; stateProvince: Tibet; county: Jilong; municipality: Jilong; locality: Latola ; verbatimLocality: Shigatse; verbatimElevation: 3954 m; verbatimCoordinates: 28 º 23 ′ 26 " N, 85 º 24 ′ 25 " E; Identification: identifiedBy: Y. Jia and Q. He; Event: year: 2018; month: 6; day: 17; habitat: On the roadside soil surface; Record Level: language: cn

Description

Plants rather small, 0.5-1.2 cm high, brownish green to reddish-brown, often in tufts (Fig. 1 a and b). Leaves nearly oblong-oval (Fig. 1 c), 1.5-2.0 × 0.5-1.0 mm, usually concave; margins serrate; costa somewhat broad, ending near the apex (Fig. 1 e); ventral lamellae slightly wavy or crisped, usually in 3-10 rows, 3-5 cells high; on leaf back with only a few spines (Fig. 1 c); median leaf cells rounded quadrate to irregularly oval, 9-15 μm wide; basal cells elongate or irregularly rectangular, 18-25 × 8-16 μm, slightly thick-walled (Fig. 1 f-h). Dioecious. Perichaetial leaves lanceolate above, sheathing at base (Fig. 1 d). Setae reddish-brown, straight; capsules oblong-ovoid to shortly cylindrical, usually curved; peristome teeth 32; opercula conical, shortly beaked. Calyptrae cucullate, smooth. Spores spherical, ca. 10 μm in diameter, finely papillose ( Wu and Jia 2004).

Distribution

China (Tibet [present study]; Guizhou, Yunnan and Fujian, India and Nepal ( Hyvönen and Lai 1991, Wu and Jia 2004).

Figures

Figure 1. Oligotrichum obtusatum Broth. a Plant; b Moist male plant; c Leaves; d Perigonial leaves; e Apex of leaf (dorsal view); f Basal leaf cells; g Cross sections of leaf; h Portion of the cross section of stem. Scale bars: i = 1 cm (a); i = 2.5 mm (b); i = 1 mm (c, d); i = 200 μm (e, h); a = 100 μm (f, g).