Lecanactis malmideoides

The thallus of Lecanactis malmideoides is continuous, minutely granular, dull, thin, and locally abraded. It is typically ochraceous but often appears darker due to the visible underlying brown bark. The thallus is surrounded by a dark brown hyphal hypothallus line about 0.3 mm wide. Apothecia are sessile with a constricted base, round to somewhat crenate (scalloped) or lobate, measuring 0.3–1.1 mm in diameter and 0.2–0.3 mm high. The disc is brown, flat, and sparingly to thickly yellowish-green with pruina, with a glossy black margin about 0.05 mm wide. The hamathecium is about 75 μm high with a brown epihymenium, and both the excipulum and hypothecium are black. Ascospores are hyaline (translucent), and filiform (thread-like). They have between 7 and 11 septa (internal partitions), measure 30–45 by 3.0–4.0 μm, are not or slightly curved, and lack a gelatinous sheath. Pycnidia were not observed to occur in this species.^[2]

Chemical spot tests on the thallus show it to be UV−, C−, and K−. No thin-layer chromatography was performed in the analysis of the species.^[2]

Lecanactis malmideoides is found on tree bark in a primary rainforest and at the time of its publication was known to occur only in Brazil.^[2]