Immersaria ferruginea C.M. Xie & Li S. 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

Immersaria ferruginea C.M. Xie & Li S. Wang sp. nov.

Figure 5a-c

Etymology.

The name " Immersaria ferruginea " refers to the rusty brown colour of the thallus.

Type.

China. Tibet: Changdu City, Mangkang Co., Quzika Village , 4093 m elev., 29°15'N, 98°40'E, on rock, 25 Sept 2020, Li-Song Wang et al. 20-69144 (KUN-holotype) .

Description.

Thallus areolate, greyish-brown, continuous; areolae 0.5-1.3 mm across, flat, less often convex, rectangular to polygonal, epruinose; margin pruinose; prothallus black, not distinct. Upper cortex 50.0-68.0 μm thick, brown; epinecral layer 17.0-40.0 μm thick; algal layer 75.0-78.0 μm thick, cells (4.0-) 7.0-13.0 μm diam., round. Apothecia frequent, densely crowded, immersed, 0.7-1.3 mm in diam.; disc black, flat, pruinose; margin pruinose, slightly raised. Exciple sometimes developed, 25.0-28.0 μm wide, brown. Hymenium 57.0-100.0 μm thick, colourless; paraphyses 1.0-3.0 μm wide, not branched, anastomosing; epihymenium 15.0-33.0 μm thick, brown; subhymenium 25.0-63.0 μm thick, colourless to pale brown, rusty or dark pink; hypothecium pale brown. Asci Porpidia -type, cylindrical; ascospores rare, 7.5-10.0 × 5.0 μm in diam., ellipsoid, halonate. Conidiomata not seen.

Chemistry.

Thallus K-, C-. Medulla I+ violet. Confluentic acid, often accompanied with 2'-O-methylmicrophyllinic acid.

Ecology and distribution.

In China, growing on quartz sandstone or granite at elevations of 3800-4300 m in the alpine zone. This species is known from Sichuan Province and Tibet of China.

Notes.

Immersaria ferruginea is characterised by its brown, rusty thallus, its densely crowded apothecia and its brown epihymenium. The morphology of Immersaria ferruginea resembles I. carbonoidea , but the latter differs in its dark black-brown thallus containing norstictic acid and black-brown hypothecium.

Specimens examined (KUN).

China. Sichuan Province: Rangtang Co., Mt. Haizi , 4227 m elev., 32°20'N, 101°25'E, on rock, 2020, Li-Song Wang et al. 20-66697, 4221 m elev., Li-Song Wang et al. 20-67670 . Tibet: Changdu City, Mangkang Co., Quzika Village , 4093 m elev., 29°15'N, 98°40'E, Li-Song Wang et al. 20-69144, 4101, Li-Song Wang et al. 20-69146, 4122 m elev., Li-Song Wang et al. 20-69148; Gatuo Town , 3848 m elev., 29°39'N, 98°35'E, Li-Song Wang et al. 20-69105 .

Figures

Figure 5. Immersaria ferruginea (a-c KUN 20 - 69144): a-b thallus c apothecial anatomy. I. shangrilaensis (d-f KUN 18 - 60430): d-e thallus f apothecial anatomy. Scale bars: 1 mm (a-b, d-e); 20 μm (c, f).