BY JOHN SHIRLEY, B SC. 13 



mersecl. Sperm atia in myriads, delicate straight rods or 

 needles, -0(H — -OOB x -0005 m.m., on delicate, narrow, 

 jointed sterigmata, about -0225 m.m. long. 



Syn. — P. laevigata v. revoluta (Lindsay) Flk. 



P. tiliacea v. revoluta (Leighton) Flk. 



P. quercifolia v. revoluta Schcer., P. rugosa, Tayl. 

 Hab. — On trees, Brisbane Valley. 



17. P. nitescens, Stirton. 



Thallus pallescent or likewise pallid cervine-fuscescent (when 

 dry), somewhat pol.shed ; laciniate, lacinia? imbricate-depres- 

 sed, sinuate-lobate, margin plane, or recu-vel and then 

 * sorediose, sparingly scattered over with minute white 

 Sn. puncture?, width about 1 m.m., or sorelioid fissures; 

 beneath black, margins spadiceous, naked, somewhat rugu- 

 lose ; medulla white (C e ythri lose or cinnabar). Apothecia 

 and spermagonia unknown. Scott. Xat. July, 1878. 



Probably a form of P. revoluta, Flk. 



Hab. — On bark near Brisbane. 



18. P. tinctorum Oespr. 



Thallus pallid glaucescent, smooth and shining, or albo- 

 pulvinate, appressed, membranaceous, rosette-shaped, divid- 

 ing from the c-.-ntre into broad rounded lobes, not laciniate, 

 lobules rising in folds at the extremities, and split-wrinkled 

 rather thon lobulate ; fracture white ; beneath brown and 

 Sn. smooth at the margins, the central parts black and rhizinose. 

 Apothecia not seen in Queensland specimens. 



Dr. Stirton in lit. F.M.B., says — " A very common lichen 

 in almost all tropical and sub-tropical countries, and one 

 that assumes many phases as all common lichens do." 



Hab. — Common on rocks and trees. 



(b.) Ochroleuc» 



* Thallus yellow at all stages. 



19. P. conspersa Khrenb. (Medulla K yellow then red.) 



Thallus orbicular, membranaceous-cartila vinous, abore 



