BY JOHN SHIRLEY, B.SC. 



183 



% % % J Rhizocarpon. — Apothecia lecidine; spores brown, 

 sparingly muriforin. 



54. L. clausa, O.K. 



Thallus smoke coloured or olivaceous or glaucous, crustaceous, 

 smooth, shining, areolate-rimose, in parts evanescent, hypo- 

 thallus black, deierniinate, apothecia nigro-fuscous, immersed, 

 disk not rising to the surface of the thallus, plane or sub- 

 convex or sub concave, no distinct margin, circular in outline, 

 one rarely two in each areola ; spores 8, in a single series, 

 usually 6-septate, murally divided, 1 — 3 cellules in each 

 K. transverse series ; loculi almost colourless, septa dark brown, 

 •03 x -015 m.m. 



Hab. — On rocks, Helidon. 



55. L. geographica v. cyclopica, Nyl. 



Thallus citrine or bright yellow, tartareous, not continuous, 

 areolate-diffract, determinate, nigro-limitate, areolae more or 

 Sy. less scattered and plano-convex, each ocellate with an apoth- 

 ecium ; apothecia black, plane, small, arising from the 

 hypothallus, concolorous without and within ; hypothecium 

 black ; spores 8, nigrescenti-fuscous, oblong, sparingly 

 parenchymatous, resembling those of L. clausa. 

 Hab. — Mt. Perry, on rocks. 



********* Heterothecium. — Apothecia patellarioid ; spores 

 hyaline, parenchymatous. 



56. L. vulpina, Tuck. 



Thallus thinly crustaceous, from golden yellow to glaucescent, 

 continuous or nearly so ; apothecia small, disk plane, small, 

 Sn. bright red ; margin thick, pale red or orange, entire or 

 flexuose, at times inflexed, immature, 

 Hab. — On bark, near Brisbane. 



57. L. leucoxantha, Mass* 



Thallus crustaceous, rather thin, fragile, flaky, bright yellow 

 to glaucescent ; apothecia large ; disk red or red-brown, 

 plane or undulate ; margin thick, flexuose, cinnabar red ; 



