480 117. Arthon. 4. CENOTHALAMEiE. PL celLaph. 
5. Arthona pruinosa. Hoary sprinkled-moss. 
Crust thin, rather tartarlike, uneven, smooth, cracked 
white ; apothecia flat, sunk, roundish, many-sided, con- 
fluent, dark brown, with a greenish-white hoar. 
LiichtMi impolitus, Ehrh. Crypt . ; Engl. Bot. 981. 
Verrucaria impoliia, Hoffm. Germ. 172. 
Parmelia impoliia, Achar. Meth. 160. 
Arthonia pruinosa, Achar. Lich. 147. 
On the bark of trees, especially oaks. 
XXVIII. 118. SPILOMA. Acharius. ( Spotted-moss* 
Thallus crustlike, flat, expanded, adnate, uniform ; apo- 
thecia composed of aggregated corpuscules; mass compact, 
homogeneous, rather mealy, naked, irregular. — Differ from 
the nematomyceae by the presence of the thallus, and by 
having no flocky threads mingled with the sporee. 
1. Spiloma tumidulum . Swollen spotted-moss. 
Crust rather cartilaginous, whitish ; apothecia crowded, 
swollen, oblong, irregular, rough, reddish afterwards black- 
ish-brown and slightly hoary. 
Sphaeria gregaria, Dicks. Crypt. 1, 22. 
Arthonia tumidula, Achar. in. Sc.hr ad. Journ. 1,3, 11. 
Spiloma fallax, Achar. Meth. 10. 
Spiloma tumidulum u and /3, Achar. Lich. 136. 
On the bark of trees. 
2. Spiloma versicolor. Changeable spotted-moss . 
Crust rather cartilaginous, powdery, cracked , greyish 
and yellow; apothecia sunk, superficial, roundish, fiat, af- 
terwards rather convex, confluent, rough, deep black. 
Arthonia versicolor, Achar. in Schrad. Journ. 1,39. 
Spiloma versicolor, Achar. Lich. 138 ; Engl. Bot. 2073. 
On the bark of trees. 
|3. variolosum. Crust leprous, powdery, greyish, rather 
warty ; apothecia hemispherical, crowded, rather confluent, 
deep black. 
Spiloma variolosum, Engl. Bot. 2077. 
Spiloma versicolor variolosum, Achar. Lich. 138. 
3. Spiloma tricolor. Three-colour spotted-moss . 
Crust rather tartarlike, cracked, powdery, white; apo- 
thecia roundish, convex, aggregated, confluent, red, when 
rubbed yellowish rust-colour. 
Spiloma tuberculosum, Engl. Bot. 2556. 
Spiloma tricolor, Achar. Lich. 137. 
On stones and the trunks of trees. 
