120 



PEZIZALES 



(1) Asci 8-spored 



(a) Spores hyaline or yellowish; disk 



globose 



(b) Spores dark; disk more or less flat 

 X. Apothecia sessile 



(x) Thallus with a cortical layer 

 (y) Thallus without a cortical layer 

 y. Apothecia stalked 



(2) Asci many-spored 



b. Spores 2-celled, dark 



(1) Apothecia sessile 



(a) Algae Pleurococcus 



(b) Algae Trentepohlia 



(2) Apothecia stalked 



(a) Apothecia with a long stalk 



(b) Apothecia with a short thick stalk 



c. Spores x-celled 



(1) Proper exciple alone present 



(2) Thalline exciple also present 



d. Sporec more or less muriform 



(1) Algae Pleurococcus 



(2) Algae Trentepohlia 

 Thallus foliose 



a. Thallus of horizontal scales with marginal 



apothecia; spores 1-celled, dark, globose 



b. Horizontal scales sterile; apothecia on cylin- 



dric podetia; spores 2-celled, dark, oblong 

 Thallus fruticose 



a. Thallus hollow-; apothecia on the under side; 



spores 1-celled, dark, globose 



b. Thallus with solid medulla; apothecia termi- 



nal 



(1) Spores 1-cellcd, dark, globose; apothecia 



enclosed in a globose thalline exciple 

 opening irregularly at the top 



(2) Spores 2-celled, dark, elliptic; apothecia 



without thalline covering, goblet-like 



Coniocybe 97; 28 



Carlosia 98 

 Holocyphis 99 

 Chaenotheca 95; 28 

 Tylophorella 100 



Cyphelium 98; 23 

 Ditylis 99 



Calicium 96; 28 

 Pyrgidium 98 



Pyrgillus 99; 28 

 Tylophorum 99 



Pseudacolium 99 

 Schistophorum 100 



Calycidium 100 

 Tholurna 100; 28 



Pleurocybe 101 



Sphaerophorus 102; 28 

 Acroscyphus 102 



Family 46. CHRYSOTRICHACEAE 



Zahlbruckner 134, 147 (117, 127) 



Apothecia disciform, margined; asci persistent, mazaedium lacking; thallus 

 uniform, cobwebby, cottony or spongy, loose, without layers, with Palmella, 

 Pleurococcus, Trentepohlia or Cladophora as algal hosts. 



A. Thallus with Palmella or Pleurococcus; spores 



hyaline 



1. Spores 1-celled 



2. Spores x-celled 



B. Thallus with Trentepohlia; spores hyaline 



1. Spores 1-celled 



2. Spores 2-celled 



C. Thallus with Cladophora; apothecia lacking 



Crocynia 135 

 Chrysothrix 135; 28 



Holocoenis 149 

 Coenogonium 148 

 Racodium 149 



