Parmotrema latissimum (Fée) Hale

Family :

Parmeliaceae

Hale, Phytologia 28: 337. 1974.  

Basionym: Parmelia latissima Fee, Ess. Crypt. Suppl.:  119. 1837

ID :

BU/BRL/2022/026

Thallus :

Foliose, loosely adnate, 3-25 cm in diam., lobate 

Lobes :

Sub irregular, elongate, becoming somewhat imbricate, plane, separate, 8-20 mm wide; apices: rotund, eciliate

Upper Side:

Gray, smooth to rugulose, dull, emaculate, becoming reticulately cracked with age

Isidia :

Soredia, Isidia and Pustulae absent

Lower Side :

 Black with brown naked zone peripherally, centrally rhizinate; rhizines: scattered, simple, black

Medulla :

White with continuous algal layer

Common, sub stipitate, up to 10 mm in diam.; margin: crenulate, emaculate; disc: brown, perforate 

Apothecia :

Ellipsoid, 28-32 x 14-16 µm Pycnidia: not seen 

Ascospores :

Upper cortex K+ yellow, C-, KC-, P-; medulla K+ yellow turning deep red, C-, KC-, P+ orange. Secondary metabolites: upper cortex with atranorin and chloroatranorin; medulla with salazinic acid (major) and consalazinic acids (minor)

Chemistry :