BY JOHtf SHIRLEY, B.SC. 



143 



prominently about 25-costate. Distinguished from P. leio- 

 placa by the whitish ostiola and by the structure of th e 

 endospore. Lich. Beit. v. Dr. J. M. XIX 15. 



13. P. trypetheliiformis, Nyl. 



Thallus cinereous, somewhat flavescent, thin, effuse, rugulose ; 

 verrucas concolorous, scarcely mediocre, about 1 m.m., at the 

 bnse cleaily distinct fiom the thallus, hemispherical and 

 often irregular, vertices sub-truncate ; ostiola small, few, at 

 M first biown, then nigricant, not depressed, mammose-emer- 

 gent ; spores 3 — 4, -04 — *09 x -022 — -045 m.m. 



Hab. — On bark near Toowoomba. 



v. Hartmanni, Mull. Arg. 



Thallus ashy, somewhat yellowish, thin, effuse, roughened ; 

 verrucas concolorous, scarcely mediocre, hemispherical, and 

 often irregular, with vertex sub-truncate, and ostiola few ; 

 M spores 2, -13 — -15 x *04 m.m. Outwardly like the type, but 

 differs in the 2-spored asci and larger spores. 



Hab. — Toowoomba, on bark. 



Lich. Beit. v. Dr. J. M. XVI., 3. 



14. P. minuta, C.K. 



Thallus grey, thin, fissured, almost continuous, evenly spread 

 over small twigs, verrucas very small with smooth apices ; 

 between the verrucas are small rugose points ; ostiola black, 

 not depressed, few punctate ; spores 2, oblong-ellipsoid, 

 marked transversely with strias as in P. communis, but 

 K the markings more delicatQ, requiring high powers, '06 — 

 •08 x -025 m.m. ; paraphyses very fine, branching, matted, 

 brownish with iodine. 



Hab. — Unrecorded. 



(b). Flavicantes. 



15. P. porinella, Nyl. 



Thallus yellowish white'or cinereo-flavescent, diffuse, leprose- 

 crustaceous, granular, with determinate margin ; verrucas 



