480 117. Arthon. 4. CERNOTHALAMEZE. Pl.cell.aph. 
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. 
Lichen impolitus, Ekrh. Crypt.; Engl. Bot, 981. 
Verrucaria impolita, Hoffm. Germ. 172, 
Parmelia impolita, Achar. Meth. 160. 
Arthonia prainosa, char. Lich, 1A7, 
On the bark of trees, especially oaks. 
XVIII. 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 nematomyceze by the presence of the thallus, and by 
having no flocky threads mingled with the spore. 
1. Spiloma tumidulum. Swollen spolted-moss. - 
Crust rather cartilaginous, whitish; apothecta crowded, 
swollen, oblong, irregular, rough, reddish afterwards black- 
ish-brown and slightly hoary. 
Spheria gregaria, Dicks. Crypt. 1, 22. 
Arthonia tumidula, Achar. in Schrad. Journ. 1,3, 11. 
Spiloma fallax, Achar. Meth, 10. 
Spiloma tumidulum « and 8, Achar. Lich. 136. 
On the bark of trees. 
2. Spiloma versicolor. Changeable spolted-mass. 
Crust rather cartilaginous, powdery, cracked, greyish 
and yellow; apothecia sunk, superficial, roundish, flat, af- 
terwards rather convex, confluent, rough, deep black. 
Arthonia versicolor, 4char.in Schrad, Journ. 1,39. ~ 
Spiloma versicolor, Achar. Lich, 138; Engl. Bot. 2076. 
On the bark of trees. 
B. 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. 
