Leptogium cyanescens (Rabenh.) Körb. (1855: 420)

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 : 132

Leptogium cyanescens (Rabenh.) Körb. (1855: 420) . ( Figure 1E )

≡ Collema cyanescens Rabenh. (1845: 50) .

Lectotype (designated by Jørgensen & James 1983):— SWITZERLAND. Ticino, Schaerer , Lich. Helv. 409 ( BM!).

Description: Kitaura (2012).

Notes: Leptogium cyanescens is recognized by the smooth, bluish thallus, with cylindrical isidia on the lamina and flattened isidia usually on the margins of the thallus.

Leptogium austroamericanum is similar, but differs by the ridged upper surface.

Leptogium cochleatum has a thalline exciple with a thick cortex as well as L. cyanescens , but it is non-isidiate and with the upper surface distinctly wrinkled.

Distribution in Brazil: First record to Mato Grosso do Sul, but previously reported to Alagoas ( Nusbaumer et al. 2015), Minas Gerais ( Aptroot 2002), Paraná ( Osorio 1977), Pernambuco ( Nusbaumer et al. 2015), Rio de Janeiro ( Vainio 1890), Rio Grande do Sul ( Spielmann 2006), Santa Catarina (Kitaura et al. 2018), São Paulo ( Kitaura et al. 2017) and Sergipe ( Cáceres et al. 2014).

Examined material: BRAZIL. Mato Grosso do Sul: Alcinópolis, Parque Estadual das Nascentes do Rio Taquari ( PENT), 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 133 ( CGMS 64753 ) ; PENT, 25 October 2017, M.J. Kitaura 4310 ; Corumbá, Morro do Urucum , 19°12’08.20”S 57°36’04.60”W, 730 m elev., on forest edge, corticolous, 3 September 2010. A.A. Spielmann, L.S. Canêz, A.P.L. Lorenz-Lemke 8520 ( CGMS 42206 ). Jaraguari, on cortex, 20°10’52.3”S 54°34’37.3” 546 m elev., s/d, C.M. Bernardo 657 ( CGMS) .

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).