Pl.cell.aph. 5. IDIOTHALAMEA:. 124. Variolar. 499 
9. Fariolaria cimerea. Grey smatlpox-moss. 
Crust round, tartarlike, thin, ash-colour, cracked; cir- 
cumference indeterminate; apothecia orbicular, very small. 
white, edge raised, soredia white. j 
Variolaria cinerea, Engl. Bot. 24) 1, 
On whinstone. 
C. Poripe. Thallus crustlike; apothecta wartshape; 
perithecium distinct. 
IV. 125. PYRENULA. Acharius. Nut-moss; 
Thallus crustlike, flat, expanded, adnate, uniform; apo- 
thecia wartshape, formed of the thallus, enclosing or sur- 
rounding at the base a single thalamium, with a simple, 
thick, black, nippled perithecium covering a globular, cell- 
bearing throughout nucleus. : 
a. Apothecia open at the mouth, or surrounding a naked’ 
thalamium. 
1. Pyrenula umbonata. Button nut-moss. 
Crust tartarlike, regular, very finely cracked, greyish= 
red ; apothecia bald, reddish, rather depressed above, slightly 
surrounding the rather prominent, nipplelike opening of 
the thalamium. 
Verrucaria thelostoma, Achar. in Winch, Bot. Guide, 2, 44, 
Lichen thelostomus, Engl. Bot. 2153. 
Pyrenula umbonata, Achar, Lich. 316. 
On whinstone. 
b. Apothecia closed, strictly surrounding the prominent 
nipple, or thalamium, but without forming a border. 
2. Pyrenula tessellata. Tessellated nut-moss. 
Crusé tartarlike, uneven, cracked in beds, yellowish-grey ; 
apothecia enlarged at bottom, depressed, closed, strictly 
surrounding the prominent part of the thalamium, which 
is terminated above by a slightly bordered mouth. 
Lichen tessellatus, Engl. Bot. 533, 
Werrucaria fuscella viridula, Achar, Lich. 290. 
Werrucaria tessellata, Achar. Meth. 1153 Lich, 289, 
Pyrenula tessellata, dchar. Syn. 126. 
On. brick-walls and stones. 
