Tephromela epichlorina (Vain.) Aptroot & Lücking 2023

Santos, Lidiane Alves dos, Aptroot, André, Souza, Maria Fernanda de, Lücking, Robert, Guzmán-Guillermo, Jorge & Cáceres, Marcela Eugenia da Silva, 2023, Four new species of Tephromela M. Choisy (Ascomycota, Tephromelataceae), three containing lichexanthone, from Brazil and Mexico, Cryptogamie, Mycologie 20 (2), pp. 11-25 : 22

Tephromela epichlorina (Vain.) Aptroot & Lücking , comb. nov.

( Fig. 5C, D )

Lecanora epichlorina Vain., Acta Societatis pro Fauna et Flora Fennica 7 (1): 91 ( Vainio 1890).

HOLOTYPE. — Brazil. Minas Gerais, Catas Altas, Caraça , alt. 1400- 1500 m, on moss on sandstone, 1885, E. Vainio distributed in Lichenes Brasilinses Exsiccati 164 (holo-, TUR [ TUR-VAIN 5645 ]).

ADDITIONAL SPECIMEN EXAMINED. — Brazil. Minas Gerais, Catas Altas, Caraça, on sandstone, 1997, Aptroot 41012 ( ABL, SP).

CHEMISTRY. — Thallus UV+ yellow, C-, P-, K-, apothecium margin UV+ yellow. With lichexanthone.

ECOLOGY AND DISTRIBUTION. — On sandstone in Campo rupestre in Caraça, Minas Gerais, Brazil; known only from Brazil.

MYCOBANK. — MB 846230.

DESCRIPTION

Thallus crustose, mineral to greenish-grey, rimose to verrucose, somewhat glossy, c. 0.3 mm thick, areoles 0.5-1 mm in diam. Prothallus absent. Apothecia present, sessile, roundish to lobate when old, numerous on the center of the thallus. Disk black, 0.5-1.5 mm in diam., flat, epruinose. Thalline margin concolorous with the thallus, glossy, 0.15-0.2 mm wide, raised above the level of the disk, crenate. Hymenium c. 100-150 µm thick, hyaline. Subhymenium c. 200 µm thick, dark orange brown. Epihymenium dark blue to black, c. 60 µm thick, pigment unchanged in K. Asci slightly clavate, 8-spored. Ascospores simple, hyaline, ellipsoid, 9-15 ×5-6 µm, wall 1-2 µm thick. Pycnidia not observed.

DISCUSSION

This species was described in Lecanora but on account of the anatomical and chemical characters belongs in Tephromela , as also suggested by an annotation label by Klaus Kalb. For differences with T. carassensis (Vain.) Aptroot & Lücking , comb. nov. and T. xanthonica Guzmán-Guillermo , sp. nov., see Discussion under T. carassensis (Vain.) Aptroot & Lücking , comb. nov. and in the key below.

Figures

FIG. 5. — Habitus and UV reaction: A, B, Tephromela carassensis (Vain.) Aptroot & Lücking, comb. nov. (type material of Lecanora carassensis Vainio), thallus and apothecium margin UV+ yellow;C, D, Tephromela epichlorina (Vain) Aptroot & Lücking, comb.nov. (lectotype material of Lecanora epichlorina Vainio), thallus and apothecium margin UV+ yellow. Scale bars: 2 mm.