Cladonia zebrathallina Aptroot & Spielmann, 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 : 143

Cladonia zebrathallina Aptroot & Spielmann , sp. nov.

( Fig. 2 )

MYCOBANK. — MB 83947.

DIAGNOSIS. — Terricolous Cladonia with squamulose thallus containing fumarprotocetraric acid and strepsilin, lobate, with black apothecia and black, globose pycnidia with filiform, curved to sigmoid conidia of 20-35 × 0.5 µm.

TYPE. — Brazil. Mato Grosso do Sul, Aquidauana, Vila Piraputanga, alt. 250 m, 20°29’S, 55°29’W, on exposed sand, 26.XI.2019, A.Aptroot 80479 (holo-, CGMS; iso-, ABL).

ADDITIONAL MATERIAL STUDIED. — Brazil. Mato Grosso do Sul: Aquidauana, Vila Piraputanga, alt. 250 m, 20°29’S, 55°29’W, on exposed sand, 26.XI.2019, A.Aptroot 80508; same locality, 26.IX.2014, A.A.Spielmann s.n. (para-, CGMS).

CHEMISTRY. — Thallus UV-, C+ blue green, P+ red, K-. TLC: fumarprotocetraric acid and strepsilin.

ETYMOLOGY. — Named after the surface pattern that reminds somewhat of a zebra, and the thallus.

DESCRIPTION

Thallus squamulose, greenish grey, consisting of short, c. 0.7-1.4 mm diam., mostly ascending squamules, corticate. Squamules flat to convex, crenate, strongly overlapping in several layers in a 2-3 mm thick crust, surface with a dense network of paler greyish pseudocyphellae, the main ones of them aligned in the length direction of the lobes. Lower surface black. Thallus squamules c. 100-200 µm thick, upper cortex hyaline, 1-2 cells thick, c. 5-10 µm, paraplectenchymatous. Apothecia common, black, lobate, convex, flat to 0.8-1.4 mm diam., sessile and not higher than the lobes, without differentiated margin. Epihymenium brown, c. 10 µm thick. Hymenium c. 100 µm high. Ascospores not observed. Pycnidia common, marginal, globose, black, 0.1- 0.2 mm. Pycnidial wall c. 35 µm thick, carbonized in the upper half. Conidia hyaline, filiform, curved to sigmoid, 20-35 × 0.5 µm.

Figures

FIG. 2. — Cladonia zebrathallina Aptroot & Spielmann, sp.nov., holotype: A, habitus; B, pycnidium;C, conidia.Width of pictures: A, 10 mm,B, 250 µm,C, 120 µm.