Taxonomy
The genus was circumscription (taxonomy), circumscribed by the French lichenologist Maurice Choisy in 1953.Description
''Tremolecia'' species are crustose lichens, appearing as a thin crust-like growth on its without a protective outer layer (). The —the photosynthesis, photosynthetic partner in this symbiotic relationship—is a single-celled green alga with nearly spherical to completely spherical cells measuring 7–14 by 6–13 micrometres. The reproductive structures (ascomata) are cup-shaped fruiting bodies called apothecia. These apothecia are of the type, meaning they have their own distinct margin, and can be either sunken into the lichen surface with a crater-like appearance ( and more or less ) or sitting on top of the surface (sessile). The —the tissue forming the rim of the apothecium—appears dark brown and opaque when viewed in cross-section. Inside the reproductive structures, the paraphyses (sterile filaments) are sparsely branched and occasionally fused (), with tips that are not swollen (not ). The ascus, asci—specialized cells that produce spores—are club-shaped and contain eight spores each. They belong to the ''Tremolecia''-type, characterized by a well-developed (thickened apical region) that staining, stains very weakly with iodine (weakly amyloid (mycology), amyloid), has a thin outer cap that does stain with iodine (external amyloid cap), and lacks a central chamber (ocular chamber). The are (not divided by septa), clear (hyaline), ellipsoid in shape, lack a gelatinous coating (non-), and have thin walls. The asexual reproductive structures (conidiomata) are flask-shaped pycnidia embedded within the lichen body. The asexual spores (conidia) are rod-shaped (). The genus does not produce any secondary metabolites detectable by standard lichen spot test (lichen), spot tests.Species
, Species Fungorum (in the Catalogue of Life), accept two species of ''Tremolecia'': * ''Tremolecia atrata'' * ''Tremolecia dicksonii'' Another four species transferred into the genus by Hannes Hertel in 1977 (''T. lividonigra'', ''T. nivalis'', ''T. similigena'', and ''T. tuberculans'') are not currently accepted by Species Fungorum. Some species that were at one time placed in this genus have since been transferred to other genera: *''Tremolecia glauca'' is now ''Paraporpidia glauca'' *''Tremolecia jurana'' is now ''Farnoldia jurana'' *''Tremolecia transitoria'' is now ''Melanolecia transitoria''References
{{Taxonbar, from=Q10701868 Lecanoromycetes Baeomycetales genera Lichen genera Taxa described in 1953 Taxa named by Maurice Choisy