Leptogium diaphanum (Sw.) Mont. (1848: 134)

Kitaura, Marcos J., Bernardo, Caique M., Koch, Natália M., Rodrigues, Andressa S., Torres, Jean-Marc, Barbosa, Thiago D., Canêz, Luciana Da S., Spielmann, Adriano A., Honda, Neli K., Fleig, Mariana & Lorenz, Aline P., 2019, Leptogium (Collemataceae, Peltigerales) from Mato Grosso do Sul state, Brazil: nine new records, three new taxa and a key for the species, Phytotaxa 399 (2), pp. 127-146 : 133

Leptogium diaphanum (Sw.) Mont. (1848: 134) . ( Figure 2A )

≡Lichen diaphanus Sw. (1788: 147).

Holotype:— JAMAICA. Ur. Med. rådet Westrings lavsamling gn Lagman Erigelblom. 1853. P.O. Swartz (GB-0128253).

Description: Cunha (2007).

Notes: Leptogium diaphanum has smooth surface, translucent thallus with simple to branched, flattened and elongated lobules on the thallus and apothecia. Thallus thickness is 30–45 μ m, resulting in the translucent appearance.

Leptogium austroamericanum , L. cyanescens and L. cyanizum are isidiate species whereas L. diaphanum has flattened lobules on the lamina.

Distribution in Brazil: First record to Mato Grosso do Sul, but previously mentioned to Rio Grande do Sul ( Käffer et al. 2015) and São Paulo ( Cunha 2007).

Examined material: BRAZIL. Mato Grosso do Sul: Alcinópolis, Parque Estadual das Nascentes do Rio Taquari , trek to the waterfall, 18°08’57.50”S, 53°24’18.81”W 476 m elev., 24 October 2017, S.M.L. Souza, L.C. Peinado, G.C. Andrella 124 ( CGMS 64752 ). Corumbá, morraria do Urucum, 19°12’08.20”S, 57°36’04.60” W, 733 m elev., on the road, corticolous, 3 September 2010, L.S. Canêz, A.A. Spielmann, A.P. Lorenz-Lemke, W.S. Fava 3236 pr. min. p. ( CGMS 32309 ) ; 3246 ( CGMS 32311 ) ; 3256 ( CGMS 32313 ) .

Figures

FIGURE 2. A–F. Leptogium species. A. L. diaphanum (LC Canêz 3246). B. L. fusisporum (NK Honda 050). C–E. L. hondae (JM Torres 509, holotype). C. Detail of the thallus. D. Transversal section of the thallus. E. Transversal section of the apothecia, arrow = cortex of thalline exciple. F. L. isidiosellum (SS Moura 112). Bars: 2 mm (A–C, F); 50 μm (D–E).