136 



THE LICHEN FLORA OF QUEENSLAND, 



** # *# Spores pertusariod — Lecanorastrum, Mull, Arg. 



20. L. parella, Ach. 



Thallus determinate, leprose to crustaceous, rimose-diffract 

 or areolate-verrucose, sordid white or ashy-grey. Apothecia 

 numerous, crowded, often angulose-difformed ; disk plane 

 or concave, dusky testaceous, coarsely albo-granulate ; 

 margin tumid, thick, often radiato-crenulate orverrucose; 

 spores 6 — 8, large, '05 — -06 x -02 m.m., double-walled, 

 Sn. colourless, simple ; paraphyses indistinct, very delicate, 

 without coloured or clavate heads. Spermagonia show as 

 minute yellow spots, sterigmata linear and simple, or slightly 

 ramose, with acrogenous sperniatia, 



Hab. — Common. 



Syn. — Pertusaria parella, Mull. Arg. 



v. phlaeoleuca, Nyl. 



Thallus almost white, very thin, and in this differing from 

 the type. Apothecia smaller than the normal form ; spores 

 Sn. -038— -05 x -020— -025 m.m. 



Hab. — On bark of apple trees, Hocking's Nursery. 



21. L. pallescens, L. 



Thallus white or cinerascent, frequently isidioid or tuber- 

 culose rugose, membranaceous or subcartilaginous or tartare- 

 ous, when membranaceous rimose or areolate-verrucose, 

 K. when tartareous friable or mealy. Apothecia pale carneous, 

 Sn. white pruinose ; margin white, thick, tumid, entire, smooth, 

 truly thalline, including gonidia. 



Hab.— Mt. Perry. 



Syn. — Pertusaria pallescens. 



22. L. subundulata, C. K. 



Thallus a beautiful pearly white, suffused with pink pruina, 

 surface even, finely rimulose. Apothecia not crowded, large ; 

 disk flat, pink-pruinose ; margin thick, rounded, ring-like, 

 K. later on undulate and involute. Thecaj clavate-cylindrical 



