190 



THE LICHEN FLORA OF QUEENSLAND, 



IV. — Thelotrema, Ach. 



Spores hyaline, but the loculi longitudinally or variously 

 divided. 



1. T. australiense, Mull. Arg. 



Thallus smooth, thin, continuous, yellow brown to dull 

 yellowish, margins a darker brown, moderately distinct. 

 M. Apothecia very numerous, small, crowded, very little raised ; 

 ostiola *2 m.m., from pale brown to nigro-fuscous, with pale, 

 crater-like surrounding apex of verruca ; perithecium within 

 obsolete, and not represented by black-brown laminula above, 

 spores -02 — -03 x -008 — 01 m.m., 6-8 locular, 1-4 loculi in 

 the centre bi-locellate, outline subl'usiform. 



Syn. — T. microporellum, Krph. (non Nyl ) 



2. T. laceratulum, Mull. Arg. 



Thallus olivaceous, thin, undulate-unequal, surface smooth ; 

 apothecia numerous, *3 — '4 m.m. in diameter, and slightly 

 emergent from the thallus, apex whitish decolorate with 

 aperient lacerate pore, furnished with 2 — 4 connivent lobules, 

 M. or at length by rupture distinctly open, depressed, almost 

 wholly white-pallid ; perithecium hyaline ; spores solitary or 

 geminate, -08 — *12 x -027 — -038 m.m., equal, hyaline, 

 closely parenchymatous, 25 — 30 locular, transversely 5 — 6 

 locellate. 



Hab. — Trinity Bay. 



Lich. Beit, von Dr. J. M XXVI. 23. 



3. T. megalophthalmum, Mall. Arg. 



Thallus olive-green, effuse, th'n, minutely rugulose, surface 

 smooth ; apothecia immersed not depressed ; ostiola usually 

 wide, 15 — 2 5 m,m., orbicular or suborbicular, with thin, 

 lacerate, concolorous exterior margin, and rather short, 

 albescent, almost wholly adherent interior excipulum, at 

 length unitedly deciduous ; disk reaching to the surface of 

 M. the thallus, not depressed, flat or when moist slightly convex, 

 carneous or finally sordid whitish ; lamina in all parts 



