GYROSTOMTJM. 229 



appearing thalline veil. Spores ellipsoid; muriform-pluri- 

 locular; brown. Spermatia not seen. Thalluscrustaceous; 

 uniform. 



G. scyptmliferum (Ach.) Fr. ; thallus cartilagineous, smooth- 

 ish ; greenish-ash-coloured becoming olivaceous-brown, deepen- 

 ing into lead-colour ; apothecia small to minute, sessile or often 

 a little elevated ; rounded passing into lirellaeforna ; the rather 

 elevated proper margin radiously striate or entire, bordering a 

 brown, powdery disk; itself thinly more or less margmate. 

 Spores in fours, sixes, and eights ; oblong- ellipsoid ; the trans- 

 verse series of spore-cells six to ten, of two to three members, 



?g* rnic. Fr. S. 0. V. p. 268. Nyl. in Proclr. N. Gran. p. 50 ; 



Syn. n. Caled. p. 39. Tuckerm. Gen. p. 140. Lecidea, Ach. Syn. 

 p. 27. 



Trees and shrubs. South Carolina, Florida and Texas 



(Ravenel), Tuckerman Gen. ]872. Louisiana, Hale. The 



radious grooving of the proper exciple reminds one of a charac- 

 teristic feature of Gyalecta; but the triple envelopes of the 

 fruit point rather to the type of Thelotrema, which also varies 

 in directions pointing towards Graphis. 



