1 6 Charles E. Bessey 



Order Caliciales. Powdery Lichens. True fungi, and lichen- 

 forming fungi ; apothecia spheroidal, sessile or stalked, the asci 

 and paraphyses breaking up into a pulverulent mass. 



Family 31. Protocaliciaceae. True fungi; apothecia sessile or 

 stalked; saprophytes. Mycocalicuim. (Syllabus 46.) 



Family 32. Caliciaceae. Crustaceous lichens with Protococ- 

 CHS, Pleiirococcus, or Trentcpohlia gonidia ; apothecia usually 

 long-stalked. Calicium. (Pf. I, i*, 80.) 



Family 33. Cypheliaceae. Crustaceous lichens with Pleuro- 

 coccits, Protococais, or Trcntcpohlia gonidia; apothecia sessile. 

 CypheUum, Tylophoron. (Pf. I, i*, 83.) 



Family 34. Sphaerophoraceae. Foliose or fruticose lichens 

 with Protococcus gonidia ; apothecia sessile or nearly so. Sphac- 

 rophonis. (Pf. I, i*, 85.) 



Order Phacidiales. Little Cup Fungi. True fungi, mostly 

 saprophytic, but sometimes parasitic, with a branching septate 

 mycelium, which bears the mostly open spore fruits (apothecia). 



Family 35. Stictidaceae. Apothecia fleshy, yellow, not black. 

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



Family 36. Tryblidiaceae. Apothecia leathery or carbona- 

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

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



Family 37. Phacidiaceae. Apothecia leathery or carbonaceous, 

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

 I, I, 256.) 



Order Exoascales. Pocket Fungi. True fungi, typically 

 parasitic, much reduced and simplified, the branching mycelium 

 bearing single or clustered asci, not forming genuine apothecia. 



Family 38. Exoascaceae. Parasitic in the tissues of higher 

 plants, producing crowded asci which break through the epi- 

 dermis. E.voasciis, Taphriiia. (Pf. I, i, 158.) 



Family 39. Ascocorticiaceae. Saprophytic, the asci forming 

 a cushion on the abundant mycelium. Ascocorticium. (Pf. I, 

 I, 161.) 



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