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PLcelLaph. 5.IDIOTHALAMEiE. 12^. Variolar. 493
9. Variolaria cinerea. Grey smallpox-moss.
Crust round, tartarlike, thin, ash-coloilr, cracked; cir-
cumference indeterminate ;
apothecia orbicular, verj small,
white, edge raised, soredia white.
Variolaria cinerea, Engl. But, 24) l._
On whin stone.
C. PoRiD.E. Thallus crustlike; apothecia wartshape;
perilhecmm distinct.
IV. 125. PYRENULA. Acharius. Nut-moss,
Thallus crustlike, flat, expanded, adnate, uniform; apo-
thecia wartshape, formed of the thallus, enclosing or surrounding
at the base a single thalamium, with a simple,
thick, black, nippled perithecium covering a globular, cellbearing
throughout nucleus.
a. apothecia open at the mouth, or surrounding a naked
thalamium.
1 Pyrenula umhonata. Button nut-moss.
Crust tartarlike, regular, very finely cracked, greyishred;
apothecia bald, reddish, rather depressed above, slightly
surrounding the rather prominent, nipplelike opening of
the thalamium.
Vernicaria thelostoma, Achar.in Winch. Bot. Guide, 2,44.
Lichen thelostomus, Engl. Bot. 2\53.
Pyrenula umbonata, Achar. Lich. 316.
On whinstone.
b. apothecia closed, strictly surrounding the prominent
nipple, or thalamium, hut without forming a lorder.
2. Pyrenula tessellata. Tessellated nut-moss.
Crust 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,
Verrucaria fuscelJa viridula, Achar. Lich. 290.
Verrucaria tessellata, Achar. Melh. 115 ; Lich, 2S9,
Pyrenula tessellata, Achar. Sjn. 126.
On brick-walls and stones.