Lichens marins - Bacidia fuscoviridis (Anzi) Lettau

Bacidia fuscoviridis (Anzi) Lettau

Bacidia fuscoviridis (Anzi) Lettau

Bilimbia fuscoviridis Anzi

Lecidea albidocarnea Nyl.

Description

Thallus crustose, more or less bordered and even cracked, bright green if humid, dirty greenish-gray if dry, paling in grass, covering from the margins of the areoles with soralia 0.1-0.3 mm, pale green, hypothallus often present, fimbriate, whitish. Apothecia rare and not always present, sterile forms being the most common, otherwise 0.5-1 mm in diameter, disc initially flat, buff, margin disappearing rapidly, subsequently apothecia rapidly become convex to strongly convex and almost sessile, orange-brown, ochraceous brown. Colorless spores, fusiform, 1-3 times septate, 12-16 x 4-5 µm according to the literature, 8-15 x 3-4 (5) µm according to our measurements. No significant color chemical reactions. Rare (or unidentified?) Species occurring on limestone rocks in the shade or in cavities not receiving direct light, often at ground level, also in cavities of alkaline or low acid rocks, sometimes on concrete. N.B. Very often infertile and then difficult to identify, but see: Bacidia fuscoviridis forme stérile.