COLLEMACEAE 



121 



Family 47. COLLEMACEAE 



Zahlbnickner 153, 164, 149, 160, 154, 158, 167, 168 

 Thallus more or less gelatinous when moist, mostly without distinct layers, 

 scaly, foliose or fruticose, rarely crustose, always with bluc-grecn algae as hosts; 

 apothecia disciform or urccolate, with persistent asci; spores typically hyaline. 



A. Thallus with Gloeocapsa, Chroococcus or Xan- 



thocapsa Subfamily Pyrenopsidae 



1. Algae Gloeocapsa 



a. Thallus crustose, scaly or dwarf fruticose 



(1) Spores 1-celled 



(a) Asci 8-spored 



X. Apothecia biatorine or almost lecidcinc Lecopyrenopsis 155 



y. Apothecia lecanorine Pyrenopsis 155 



(b) Asci many-spored Pleopyrenis 155 



(2) Spores 2-celled Cryptothele 155 



b. Thallus foliose, a single leaf attached in the 



middle 



c. Thallus fruticose, attached by delicate rhizoids Synalissa 155 



2. Algae Chroococcus 



a. Thallus crustose; apothecia more or less open 



b. Thallus foliose, a single leaf attached in the 



middle; apothecia closed 



3. Algae Xanthocapsa 



a. Thallus crustose 



(1) Spores 1-celled 



(a) Hymenium with an epithecial mass of 



algae and hyphae 



(b) Hymenium without epithecial mass 

 X. Asci normally 8-spored; pseudopar- 



enchymic cortex lacking 

 y. Asci many-spored; pseudoparenchymic 

 cortex present 



(2) Spores 2-celled; apothecia closed 



b. Thallus foliose, of a single umbilicate leaf, 



often lobed 



(1) Thallus pseudoparenchymic 



(2) Thallus not pseudoparenchymic 

 (a) Spores 1-celled 



X. Hyphae loose, reticulate at margin 



Phylliscidium 155 

 Synalissa 155 



Pyrenopsidium 155 



Phylliscum 156; 28 



Gonohymenia 157 



Psorotichia 157 



Forssellia 157 

 Collemopsidium 157 



Anema 157 



Thyrea 158 

 y. Hyphae dense, perpendicular to margin Jenmania 158; 28 



(b) Spores 2-celled 

 c. Thallus fruticose, erect 



(1) Thallus without layers 



(a) Asci 8-spored 



(b) Asci many-spored 



(2) Thallus layered, with a cortex 

 B. Thallus with Nostoc 



1, Apothecia biatorine 

 a. Spores 1-celled 



(1) Spores globoid to fusoid, straight 



(a) Thallus crustose, scarcely gelatinous 



(b) Thallus scaly or dwarf fruiticose, gelat- 



inous 



Paulia 159 



Peccania 159 

 Pleoconis 160 

 Phloeopeccania 160 



Leprocollema 165; 29 

 Lcciophysma 166 



