1 8 Charles E. Bessey 



Family 49. Cordieritidaceae. Apothecia on the ends of a 

 branched, carbonaceous, brittle stroma; saprophytes. Cordierites. 

 (Pf. I, I, 241.) 



Family 50. Cyttariaceae. Apothecia sunken in the surface of 

 a bulbous, stalked, hard stroma, which eventually is gelatinous; 

 parasites. Cyttaria. (Pf. I, i, 241.) 



Order Helvellales. Helvellas. True fungi, saprophytic, 

 with a branching filamentous mycelium ; apothecia open from the 

 first, sessile or more commonly stalked, often convex, fleshy or 

 gelatinous. 



Family 51. Rhizinaceae. Apothecia fleshy, expanded, sessile. 

 Rhisina. (Pf. I, i, 171.) 



Family 52. Geoglossaceae. Apothecia fleshy, capitate, stalked ; 

 asci opening by a slit. Mitrida, Geoglossum. (Pf. I, i, 163.) 



Family 53. Helvellaceae, Apothecia fleshy, capitate, stalked ; 

 asci opening by a lid. Morchella, Verpa, Helvetia. (Pf. I, i, 

 167.) 



Order Graphidales. Slit Lichens. Lichen-forming fungi, in 

 which the elongated apothecium opens by a narrow slit, which is 

 usually black-margined. 



Family 54. Arthoniaceae. Crustaceous lichens with Palmella, 

 Trentepohlia, or Phyllactidiiim gonidia ; apothecia not margined, 

 roundish to oval. Arthonia, ArthotJieliiim. (Pf. I, i*, 89.) 

 Compare Family 46. Cclidiaceac. 



Family 55. Graphidaceae. Crustaceous lichens with Palmella 

 or Trentepohlia gonidia; apothecia single, margined, oval or 

 roundish. Opegrapha, Graphis, Graphina. (Pf. I, i*, 92.) 



Family 56. Chiodectonaceae. Crustaceous lichens with 

 Trentepohlia or Phycopeltis gonidia ; apothecia round or elon- 

 gated, sunken in the stroma. Sarcographa, Chiodecton. (Pf. 

 I, I*, 102.) 



Family 57. Dirinaceae. Crustaceous lichens with Trente- 

 pohlia gonidia ; apothecia round or elongated, superficial. Dirina. 

 (Pf. I, I*, 105.) 



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