Search on : Taxa descriptions

 


 
 Add this item to the list  833379 Original description
   
Remarks (public):Ecology and Distribution: Known only from the Galapagos; all specimens occur on ±sheltered and shaded rocks in the transition zone. Notes: This species, formally described here, has previously been reported as Lecanora sp. by Bungartz et al. (2013) in their key to the leprose and leproid Galapagos lichens. Lecanora dissoluta contains the same set of terpenoids, but produces atranorin instead of usnic acid and an unknown pigment (Elix & Lumbsch 1996). 
Description type:Original description 
Description:Thallus saxicolous, leproid, primary thallus indistinct, almost entirely dissolved into ecorticate, granular soredia on a byssoid arachnoid (‘fluffy’, ‘cottony’) hypothallus, effuse, not distinctly delimited, granules yellowish green, somewhat paler where eroded, ecorticate, ill-defined, mealy, very variable in size, rarely extremely finely farinose (4.5–)9.5–22(–42) µm in diam. especially where eroded, but usually larger, (82–)91–133(–142) µm in diam., occasionally irregularly aggregating, generally loosely packed, becoming covered by a coating of needle-shaped crystals after prolonged storage in the herbarium; photobiont green, coccoid, 6–12 μm in diam. Apothecia and pycnidia unknown. Chemistry: Thallus cortex P-, C-, KC± yellowish brown, K± yellowish brown, UV-(dull); with usnic acid [major], zeorin [minor], and a extensive array of unidentified terpenes [minor] (the same, characteristic terpenes occur in Lecanora dissoluta, and form a coating of needle-shaped crystals in old herbarium specimens, giving the thallus an overall moldy appearance). 
Taxon name: