Lathagrium fuscovirens (With.) Otalora, P.M. Jorge & Wedin
Collema fuscovirens (With.) J.R. Laundon
Collema furvum (Ach.) DC.
Collema tuniforme (Ach.) Ach.
Thallus foliose, shaped in a 3-5 cm diam. rosette, well applied on its substrate, formed by lobes not very numerous, with round tips, straightened up and wavy, brown-olive dark and a bit translucent but not inflated when moist, brown-blackish when dry, covered mostly in the center of small isidia, laminal and globose, 0.2-0.3 mm diam., concolour and not inflating when moist. Apothecia more or less abundant, sessile, laminal, 0.5-2 mm diam., concave to planar disc, brown-red, thick margin, smooth to isidiate. Ascospores hyalin, submuriform with 3 transversal septa and 1 longitudinal, 15-25 x 7-14 µm. Photobiont : Nostoc. Species relatively common on sunny - but with water streaming - limestone. Cf. Lathagrium (Collema) auriforme with bigger isidia, slightly inflating - like the thallus - when moist, and Collema subflaccidum with lobes flattened on the substrate and growing seldomly on rocks.*