Lecaimmeria tuberculosa C.M. Xie & Xin Y. Wang, 2022

Xie, Cong-Miao, Wang, Li-Song, Zhao, Zun-Tian, Zhang, Yan-Yun, Wang, Xin-Yu & Zhang, Lu-Lu, 2022, Revision of Immersaria and a new lecanorine genus in Lecideaceae (lichenised Ascomycota, Lecanoromycetes), MycoKeys 87, pp. 99-132 : 99

Lecaimmeria tuberculosa C.M. Xie & Xin Y. Wang sp. nov.

Figure 10f-i

Etymology.

The name " Lecaimmeria tuberculosa " refers to the tuberculiform conidiomata.

Type.

China. Gansu Province: Zhangye City, Sunan Co., Along the way from Sunan to Qilian , 3928 m elev., 38°37'N, 99°28'E, on rock, 30 May 2018, Li-Song Wang et al. 18-58865 (KUN-holotype) .

Description.

Thallus areolate, red-brown, continuous; areolae 0.5-1.3 mm across, slightly convex, epruinose; margin pruinose, often jade-green pigmented; prothallus not distinct. Upper cortex ca. 27.0 μm thick, orange; epinecral layer up to 28.0 μm thick, uneven, sometimes absent; algal layer ca. 50.0 μm thick, cells 6.0-10.0 μm diam., round. Apothecia frequent, scattered, immersed, 0.3-0.6 mm in diam.; disc red-brown, concave, epruinose; margin absent. Hymenium 55.0-83.0 μm thick, colourless; paraphyses ca. 2.0 μm wide, unbranched, not anastomosing; epihymenium 15.0-30.0 μm thick, orange; plectenchyma ca. 5.0 μm thick, discontinuous; subhymenium ca. 38.0 μm thick, colourless; hypothecium brown. Asci Porpidia -type, cylindrical, eight-spored; ascospores 6.0-12.5 × 3.0-5.0 μm in diam., ellipsoid, halonate. Conidiomata stellate, strongly convex, rarely immersed, forming tuberculiform, black, margin pruinose, jade-green pigmented; conidia 3.0-4.5 × 1.0 μm in diam., oblong to bacilliform.

Chemistry.

Thallus K-, C-. Medulla I+ violet. No substances by TLC.

Ecology and distribution.

In China, growing on the Qilian jade or sandstone at elevations of 3900-4200 m in the alpine zone. This species is known from Qinghai Province and Gansu Province of China.

Notes.

Lecaimmeria tuberculosa is characterised by its red-brown thallus, the jade-green pruinose colour at the margin of its areolae, its red-brown, concave apothecia without a proper margin and tuberculiform conidiomata. Lecaimmeria qinghaiensis is similar to L. tuberculosa (see notes for L. qinghaiensis ). Lecaimmeria tuberculosa usually grows on jade and, interestingly, the margin of the conidiomata and areolae of the species are heavily jade-green pigmented. Lecaimmeria iranica resembles L. tuberculosa by the absence of an apothecial margin, but differs in its immersed conidiomata and the white margin of its areolae.

Specimens examined (KUN).

China. Qinghai Province: Gande Co., Qingzhen Village , 4124 m elev., 34°11'N, 100°12'E, on rock, 2020, Li-Song Wang et al. 20-68077, 4145 m elev., Li-Song Wang et al. 20-68055 . Gansu Province: Zhangye City, Sunan Co., along the way from Sunan to Qilian , 3928 m elev., 38°37'N, 99°28'E, on rock, 2018, Li-Song Wang et al. 18-58856, 18-58857, 18-58865, 18-59835 .

Figures

Figure 10. Lecaimmeria tibetica (a-e KUN XY 19 - 1288): a-b thallus c apothecial anatomy d ascus e ascospore. L. tuberculosa (f-i KUN 18 - 58864): f thallus g conidiomata h apothecial anatomy i ascospores. Scale bars: 1 mm (a-b, f-g); 20 μm (c); 50 μm (h); 10 μm (d, e, i).