Dictyonema hernandezii Lücking, Lawrey & Dal-Forno  

Mycobank MB 517761

Thallus starting out as small, circular crust but soon covering large areas of the substrate, appressed-filamentous, composed of a strongly compressed mat of densely interwoven, blue-green cyanobacterial filaments embedded in a yellowish white thallus matrix which forms an often zonate, yellowish white to brown prothallus free of cyanobacteria; the entire structure appearing gelatinous when wet. Thallus in section 300–500 µm thick, composed of a dominant medullary layer with numerous, interwoven hyphae, above which is a strongly compacted photobiont layer with more or less periclinally arranged cyanobacterial filaments; upper part strongly compacted and forming a thin, pale yellow, cortex-like layer. Cyanobacterial filaments blue-green to yellow-green with cells 10–12 µm wide and 3–5 µm high; surrounded by a thin fungal sheath forming jigsaw puzzle-shaped cells, the same cells extending above the photobiont layer to form the thin cortex. Clamps not observed on the medullary hyphae. Basidiocarps not observed.