CONOTREMA. GYALECTA. 217 



Spores in eights ; -g^ mic. Fr. L. E. p. 244. Th, Fr. Scand. 



p. 312. Thelotrema hymenium, Turn. & Borr. Lich. Brit. p. 185, 

 max. p. Pertusaria, Tuckerm. Syn. N. E. p. 85. Porinafallax, 

 Ach. Syn. p. 110, a. 



Trunks. Northern and middle States, Muhlenberg Catal. 

 1818 ; Halsey, etc. California, Bolander. 



Sub-Fam. 3. URCEOLARIEI. 



Apothecia typically urceolate, descending even to appar- 

 ently Verrucariaceous forms ; but in fact Lecanorine, which 

 affinity is often sufficiently expressed. 



XXXIV. C6NOTREMA, Tuckerm. 



Apothecia urceolate, truncate-conoid; at length some- 

 what explanate, and patella3form ; consisting of a black 

 proper exciple clothed with an evanescent veil of the thal- 

 lus. Spores cylindraceous, plurilocular, colourless. Sper- 

 matia oblong, straight ; on simple sterigmas. Thallus crus- 

 taceous; uniform. 



C. urceolatum (Ach.) Tuckerm. ; thallus cartilagineous-mem- 

 branaceous, smooth, becoming chiuky and rugged; whitish; 

 apothecia small, sub-sessile; more or less white- pruinose within. 



Spores long-cyliudraceous; 30-40-locular ; ^^ mic. Lecidea, 



Ach. L. U. p. G71. Gyrostomum, Fr., Tuck. Lich. exs. n. 100. 

 Conotrema, Tuck. Syn. N. Eng. p. 86; Gen. Lich. p. 129. 



On trees. Northern and middle States (Swartz), Acharius 

 I. c. 1810, Muhlenberg, etc. Illinois, Hall. Maryland and Vir- 

 ginia, Tuckerman. Mountains of South Carolina, Eavenel. 



Apothecia O mm -, 5 to l mm - in diameter. 



XXXV. GYALECTA (Ach.) Anzi. 



Apothecia urceolate-sub-biatorine, with a somewhat cren- 

 ulate margin ; consisting of a coloured (rarely black) proper 

 exciple, connivent, or now explanate, margined or veiled by 

 a lecanorine, or variously imperfect thalline one. Spores (in 



