Leptogium cochleatum (Dicks.) P.M. Jørg. & P. James (1983: 113)

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 : 130-132

Leptogium cochleatum (Dicks.) P.M. Jørg. & P. James (1983: 113) . ( Figure 1C )

≡ Lichen cochleatus Dicks. (1785: 13) .

Lectotype (designated by Jørgensen & James 1983):— ENGLAND. Dickson 1784 ( LINN).

Description: Aragón et al. (2005).

Notes: Leptogium cochleatum is characterized by the distinctly striate upper surface at 20× magnification and the subpedicellate apothecia on the lamina ( Jørgensen & James 1983, Aragón et al. 2005).

The examined specimen from Mato Grosso do Sul is more striate than European specimens, and further studies are still necessary.

The apothecia of L. cochleatum are constituted by thick paraplectenchymatous cortex at the thalline exciple, like in L. azureum (Sw.) Mont. (1840: 129) and L. moluccanum (Pers.) Vain. (1890: 223) . However, L cochleatum has distinctly striate upper surface ( Jørgensen & James 1983, Aragón et al. 2005) while L. azureum and L. moluccanum have smooth surfaces.

Distribution in Brazil: First record to Mato Grosso do Sul, previously reported to Minas Gerais ( Aptroot 2002) and Rio Grande do Sul ( Spielmann 2006).

Examined material: BRAZIL. Mato Grosso do Sul: Corumbá, Reserva Acurizal, córrego Fundão, 2.5 Km of waterfall, 17°54’00.8”S, 57°33’45”W, along córrego Fundão, next to local da Gaita, alluvial soil with organic matter, inclined area, 09 May 2003. V.J. Pott, L.C.P. Lima, C. Strüssmann, L. Rebellato 6281 (CGMS 51046).

Figures

FIGURE 1. A–F. Leptogium species.A. L. austroamericanum (TH Stefanello 79). B. L. chloromelum (SS Moura 111). C. L. cochleatum (VJ Pott 6281). D. L. coralloideum (TD Barbosa 672). E. L. cyanescens (SML Souza 133). F. L. cyanizum (LS Canêz 32423). Bars: 2 mm (A–F).