140 24. COENOGON1ACEAE [83. Pachyphiale 



1. Ramonia Valenzueliana (Mont.) Stizenb., Ber. St. Gall. Nat. Gesell. 168. 

 1862. 

 Parmelia Valenzueliana Mont., in Sagra, Hist. Nat. Cub. 205. 1840. Gyalecta 

 Valenzueliana (Mont.) Tuck. R. Valenzueliana f. absconsa (Tuck.) Zahlbr. 

 Gyalecta Valenzueliana f. absconsa Tuck. 

 Thallus thin, chinky or densely granulose, greenish gray; apothecia minute, 

 0.15-0.3 mm. across, subsessile, the disk deeply concave to flat, blackish brown, 

 the proper exciple flesh-colored to blackish, nearly closing over the disk but finally 

 opening, radiately striate, covered laterally by a thalloid one; spores 12-30, ellip- 

 soid, 12-16 X 6-8 fx. 

 On trees, Florida. 



83. Pachyphiale Lonnr., Flora 41:611, 612. 1858. 



Thallus crustose, chinky, scurfy, or powdery, showing little or no differentiation 

 into layers, attached to the substratum by hyphal rhizoids; apothecia minute to 

 small, adnate to sessile, closed to open, the disk concave to more or less flat, the 

 exciple colored like the disk, thin, sometimes surrounded by a thin, soon dis- 

 appearing, thalloid one; hypothecium hyaline; hymenium hyaline or brownish 

 above; paraphyses unbranched, spongy; asci clavate; spores 12-many, hyaline, 

 fusiform to needle-shaped, 3-13-septate, the cells cylindrical. 



The algal host is Trentepohlia. 



1. Pachyphiale fagicola (Hepp) Zwackh., Flora 45:506. 1862. 



Bacidia fagicola Hepp; Arm, Flora 41:504. 1858. Secoliga fagicola (Hepp) 

 Koerb. Gyalecta fagicola (Hepp) Kremphl. Gyalecta corticola (Lonnr.) 

 Tuck. Gyalecta ceratina Tuck. Lecidea congruella Nyl. 



Thallus very thin, chinky or scurfy to powdery, pale greenish to brownish, 

 sometimes disappearing; apothecia minute to small, 0.15-0.4 mm. across, subsessile, 

 the disk concave, reddish flesh-colored to dark reddish and blackening, the proper 

 exciple commonly of the same color, the thalloid one absent or disappearing; 

 spores 12-20, 3-9-septate, 15-34 X 3-6 /x. 



On trees, Massachusetts and Minnesota. 



24. COENOGONIACEAE 



Thallus of septate branching hyphae forming a network about the filaments 

 of the algal host, sometimes giving the appearance of a small, prostrate or upright, 

 branched thallus; apothecia round, lateral or terminal, the proper exciple well 

 developed. 



The algal hosts are Trentepohlia or Cladophora. 



A. Apothecia unknown 85. Racodium 



A. Apothecia frequent 84. Coenogonium 



84. Coenogonium Ehrh., in Nees, Hor. Phys. Berol. 120. 1820. 



Thallus of elongated, many-celled, branched, hyaline hyphae, forming a more 

 or less well-developed network over the surface of the monopodially branched 

 algal host; apothecia biatoroid, pale within, usually subsessile but infrequently 

 shortly stipitate, the exciple and the hypothecium plectenchymatous; paraphyses 

 hyaline, unbranched, distinct and somewhat loosely arranged; asci clavate or 

 more commonly varying toward cylindrical forms; spores 8, hyaline, ellipsoid, 

 non- or 1 -septate, usually more or less plainly uniseriately arranged. 



The algal host is Trentepohlia. 



