LECIDEACEAE 



125 



(1) Paraphyses simple 



(a) Spores 1-celIed 



(b) Spores 2-celled 



(2) Paraphyses ramose, often united 



(a) Spores 2-celled 



(b) Spores x-celled 



(c) Spores many-celled, acicular 



2. Thallus with Pleurococcus or Palmella 



a. Exciple with an external byssoid mass of 



hyphae 



(1) Spores x-celled 



(a) Spores hyaline; exciple dark within 



(b) Spores dark; exciple hyaline 



(2) Spores muriform 



b. Exciple without external byssoid mass 



(1) Asci 1-8-spored, rarely 16-32-spored 



(a) Spores 1-cellcd 

 X. Spores hyaline 



(x) Asci 1-2-spored; spores large, thick- 

 walled 

 (y) Asci 8-spored 

 m. Exciple black, carbonous 

 n. Exciple hyaline or colored, not car- 

 bonous 

 (z) Asci 16-32-spored 

 y. Spores dark 



(b) Spores 2-celled 

 X. Spores hyaline 



(x) Paraphyses simple 

 m. Spores thick-walled, large 

 n. Spores thin-walled, small to medium 

 (m) Thallus with cortex 

 (n) Thallus without cortex 



r. Exciple and hypothecium dark or 



black 

 s. Exciple and hypothecium clear or 

 bright 

 (y) Paraphyses ramose, in a slimy hy- 

 menium 

 y. Spores dark; paraphyses ramose 



(c) Spores x-celled 



X. Spores elliptic to long-fusoid 

 (x) Thallus not corticate, crustose-uni- 



form 

 (y) Thallus corticate, warty to scaly 



y. Spores acicular to filiform 



(d) Spores muriform 

 X. Spores hyaline 



(x) Spores with mucous sheath; paraph- 

 3'ses ramose 



(y) Spores without mucous sheath; pa- 

 raphyses simple 

 y. Spores dark, with mucous sheath 



(2) Asci myriosporous 



Pseudolecanactis 131 

 Catinaria 131 



Arthoniactis 131 

 Lecanactis 131; 30 

 Scolecactis 132 



Subfamily Byssolomae 



Byssoloma 133 

 Asteristium 134 

 Amphischizonia 134 

 Subfamily Lecideae 



Mycoblastus 195 



Lecidea 192; 30 



Biatora 193; 30 

 Pleolecis 195 

 Orphniospora 195 



Megalospora 197 

 Thalloedema 199 



Catillaria 196 



Biatorina 196 



Diphanis 200 

 Catocarpus 200 



Bacidia 197; 30 

 Toninla 198 

 Scoliciosporum 198 



Phalodictyum 200 



Lopadium 199; 30 

 Rhizocarpum 200 

 Biatorella 214 



