Department of Botany,
Bharathiar University, Coimbatore - 641 046
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 :
