24 Charles E. Bcssey 



Family 30. Trypetheliaceae. Crustaceous lichens, with Chroo-^ 

 lepus gonidia; perithecia clustered, erect, sunken. Trypethelinm. 

 (Pf. I, I*, 69.) 



Family 31. Paratheliaceae. Crustaceous lichens, with Chroo- 

 lepiis gonidia; perithecia single, with narrow, tubular ostiole. 

 Parathclmm. (Pf. I, i*, 71.) 



Family 32. Astrotheliaceae. Crustaceous lichens, with Chroo- 

 lepiis gonidia; perithecia clustered more or less radially. As- 

 trothdinm, Parinentaria. (Pf. I, i", y2.) 



Family 33. Strigulaceae. Crustaceous lichens, with Cephaleu- 

 riis or Phyllactidium gonidia; perithecia single, erect. Phyllo- 

 porinia, Strigula. (Pf. I, r% 74.) 



Family 34. Pyrenidiaceae. Crustaceous to scaly, and folia- 

 ceOus lichens with Nostoc, Scytoncma, or Sirosiphon gonidia ; 

 perithecia single, erect. Pyrenidiuin. (Pf. I, i'% y6.) 



Family 35. Mycoporaceae. Crustaceous lichens with Palmclla 

 or Chroolcpus gonidia; perithecia flattened, more or less subdi- 

 vided. Mycopornm. (Pf. I, i'% yy.) 



Order Phacidiales. True fungi, mostly saprophytic, but 

 sometimes parasitic, with a branching septate mycelium, which 

 bears the mostly open spore fruits (apothecia). 



Family 36. Stictidaceae. Apothecia fleshy, yellow, not black. 

 Propolis, Stictis. ( Pf . I. i, 245.) 



Family 37. Tryblidiaceae. Apothecia leathery or carbonace- 

 ous, black, at first sunken in the substratum but later erumpent. 

 Tryblidium, Sclcrodcrris. (Pf. I, i, 253.) 



Family 38. Phacidiaceae. Apothecia leathery or carbonaceous, 

 black, sunken in the substratum. Phacidimn, Rhytisma. (Pf, 

 I, I, 256.) 



Order Graphidales. Lichen-forming fungi, allied to the pre- 

 ceding, and some of the succeeding families. Apothecia usually 

 elongated, opening by a slit. 



Family 39. Arthoniaceae. Crustaceous lichens with Pahnella, 

 Chroolcpus, or PhyUactidinin gonidia ; apothecia not margined, 

 roundish to oval. Arthonia, ArthothcUnm. (Pf. I, 1'-% 89.) 

 Compare Family 53. CcUdiaccac. 



298 



