Search on : Taxa descriptions

 


 
 Add this item to the list  563415 Original description
   
Remarks (public):This new genus comprises the Ocellularia clandestina group as first circumscribed by Frisch et al. (2006). The genus is well-characterized by a combination of Ocellularia-type apothecia (usually carbonized and with columella, lacking periphysoids) and non-amyloid ascospores with diamond-shaped lumina (trypethelioid). The phylogenetic placement in the Fissurina-clade (subfamily Fissurinoideae) comes as surprise, especially as the apothecia closely resemble non-related species in Ocellularia s.lat. (e.g. Ocellularia pyrenuloides, Melanotrema spp.; Rivas Plata and Lumbsch, 2011; Rivas Plata et al., 2011c). However, the unique ascospores link this new genus to other genera in subfamily Fissurinoideae. 
Description type:Original description 
Description:Thallus white-grey to yellow-grey, smooth to uneven, ecorticate or with dense, prosoplectenchymatous cortex; photobiont layer and medulla with clusters of calcium oxalate crystals usually above and between photobiont cells. Apothecia immersed to erumpent, rounded to angular; disc usually covered by narrow pore and filled by brown-black, often white-pruinose columella; margin entire to fissured-lobulate, fused, brown-black. Columella usually present, mostly carbonized. Excipulum prosoplectenchyma¬tous, mostly carbonized. Periphysoids absent. Paraphyses unbranched. Ascospores usually 8/ascus, ellipsoid, with thick septa and diamond-shaped lumina (Trypethelium-type), colorless, I- (non-amyloid), 3-septate to (sub-)muriform. Secondary chemistry: no substances or stictic acid and satellites (then thallus section with K+ yellow efflux under the microscope). 
Taxon name: