Lecanora lichexanthoxylina Aptroot & M.F. Souza, 2021

Aptroot, André, Souza, Maria Fernanda & Spielmann, Adriano Afonso, 2021, Two new crustose Cladonia species with strepsilin and other new lichens from the Serra de Maracaju, Mato Grosso do Sul, Brazil, Cryptogamie, Mycologie 20 (8), pp. 137-148 : 144-147

publication ID	https://doi.org/ 10.5252/cryptogamie-mycologie2021v42a8
persistent identifier	https://treatment.plazi.org/id/03F987C6-FFDC-BB5D-FC5B-F940E81FFC29
treatment provided by	Felipe
scientific name	Lecanora lichexanthoxylina Aptroot & M.F. Souza
status	sp. nov.

Treatment

Lecanora lichexanthoxylina Aptroot & M.F. Souza View in CoL , sp. nov.

( Fig. 4 View FIG )

MYCOBANK. — MB 83949.

DIAGNOSIS. — Lignicolous Lecanora with abundant apothecia with crenulate thalline margin and specially with the presence of lichexanthone.

TYPE. — Brazil. Mato Grosso do Sul, Miranda, Salobra, alt. 120 m, 20°10’19”S, 56°30’26”W, on wooden fence post, 26. VI.2020, A.Aptroot & M.F. Souza 81310 (holo-, CGMS; iso-, ABL).

ADDITIONAL MATERIAL EXAMINED. — Brazil. Mato Grosso do Sul: Campo Grande, UCDB campus, on wooden fence post, 13.III.2020, A.Aptroot & M.F. Souza 80870; Naviraí, Fazenda Três Irmãos, on wooden fence post, 28.IX.2019, A.Aptroot 80311 (para-, CGMS).

CHEMISTRY. — Thallus and apothecia UV+ yellow, C-, P-, K-. TLC: lichexanthone.

ETYMOLOGY. — Named after the lichexanthone content and the occurrence on wood.

ECOLOGY AND DISTRIBUTION. — On wooden poles and fences; so far only known from one state in Brazil, but expected to occur in other states and countries.

DESCRIPTION

Thallus crustose, lignicolous, greyish white, smooth, mostly obscured by apothecia, without prothallus.Apothecia obscuring most of the thallus, sessile, irregularly angular while crowded,

0.3-0.6 mm diam. Margin of thallus colour, bulbose, crenate to coronate, higher than the disk, c. 0.1 mm wide. Disk pale ochraceous, without pruina. Epihymenium pale brown, without crystals. Hypothecium hyaline. Excipulum with large

FIG 5. — Trypethelium muriforme Aptroot & M.F. Souza , sp. nov.: A, holotype, habitus; B, Aptroot & Souza 81453, habitus; C, holotype, ascospore. Width of pictures: A, B, 15 mm; C, 90 µm.

calcium oxalate crystals. Ascospores 8/ascus, 9-11 × 5-6 µm. Pycnidia not observed.