84 PHYSCIACEAE— MOLLISIACEAE 



(i) Apothecia with thalline exciple 



(a) Asci 8-spored Rinodina 232 



(b) Asci 12-24-spored *Pleorinis 233 

 (2) Apothecia with proper exciple only 



Buellia 231 

 1). Thallus with cortex, foliose or fruticose 



( 1 ) Upper cortex of perpendicular hyphae, pseudoparenchymatic 



(a) Apothecia with thalline exciple 



x. Hypothecium clear Physcia 234 



y. Hypothecium black Dirinaria 235 



(b) Apothecia with proper exciple only 



Pyxine 234 

 ( 2 ) Upper cortex of hyphae parallel with the long axis, not pseudoparen- 

 chymatic : apothecia with proper exciple 



Anaptychia 236 



II. Spores 3-4-celled 



1. Spores clear 



a. Thallus without cortex, uniform or crustose 



(1) Apothecia with thalline exciple *Meroplacis 228 



( 2 ) Apothecia with proper exciple only 



Xanthocarpia 227 



1>. Thallus with cortex, fruticose Niorma 230 



2. Spores brown 



a. Thallus without cortex, uniform or crustose 



(1) Apothecia with thalline exciple *Merorinis 233 



(2) Apothecia with proper exciple alone 



Diplotomma 232 



b. Thallus with cortex, foliose; exciple proper 



*Phragmopyxine 234 



III. Spores muriform, brown 



1. Thallus without cortex, uniform or crustose 



*Dictyorinis 233 



2. Thallus with cortex, foliose Hyperphyscia 236 



Family 44. MOLLISIACEAE 



Rehm 503 



Apothecia superficial or erumpent, cupulate to disk-shaped, mostly smooth, rare- 

 ly with hairs, typically soft-waxy; distinguished from all other families by the 

 typically brownish exciple, which is entirely parenchymatic, or at least about the 

 base. 



Subfamily Eumollisiae 

 Apothecia superficial from the beginning 



Hyalosporae 



Spores hyaline, i-celled, globose to elliptic 



I. Apothecia not on a subicle 



1. Spores globose Mollisiella 18:64 



2. Spores elliptic to fusoid Mollisia R. 511, 8:321 



