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 

 b. 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-celIed 



1. Spores clear 



a. Thallus without cortex, uniform or crustose 



(i) Apothecia with thalline exciple *Meroplacis 228 



(2) Apothecia with proper exciple only 



Xanthocarpia 227 



b. Thallus with cortex, fruticose Niorma 230 



2. Spores brown 



a. Thallus without cortex, uniform or crustose 



(i) 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, fnliose Hyperphyscia 236 



Family 44. MOLLISIACEAE 



Rehm S03 

 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 EumoUisiae 



Apothecia superficial from the beginning 



Hyalosporae 



Spores hyaline, i-celled, globose to elliptic 

 I. Apothecia not on a subicle 



1. Spores globose MoUisiella 18:64 



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



