LICHENS 
79 
Thallus thin or obsolete. 
Apothecia small, thallus usually evident.... platycarpa. 
Apothecia large, thallus obsolete. ...platycarpa steriza. 
Thallus granulate. 
Surface of the apothecium shining as if polished. 
melancheima. 
Surface of the apothecium dull. 
Thallus ash-colored. 
Apothecia small ..... .....enteroleuca. 
Apothecia large. conjluens. 
Thallus yellowish... enteroleuca Jlavida. 
24. Leeidea melancheima Tuck. 
Lecidea melancheima Tuckerman, Syn. Lich. N. E. 68. 1848. 
St. Lawrence Island (Trelease, S32 in part). New to Alaska. 
The specimen is on wood associated with Placodlzan ferrugineum. 
Tuckerman reports its occurrence in New England and Colorado. 
25. Lecidea enteroleuca Ach. 
Lecidea enteroleuca Acharius, L. U. 177. 1810.— Sowerby, Eng. Bot. t. 1450. 
Sitka (Trelease, 8250; in part) ; Hot Springs, Baranof Island (Tre¬ 
lease, 963); Port Clarence (Trelease, 942) ; St. Michael (Setchell). 
Both Nylander and Rothrock report this from Port Clarence. Roth- 
rock also lists it for Sitka, Chamisso Island, and Cape Lisburne, col¬ 
lected by Dr. Bean. 
26. Lecidea enteroleuca flavida Fr. 
Lecidea eziterolezica flavida Fries, Vet. Akad. Handl. 261. 1824. 
Sitka (Trelease, 825a in part). New to Alaska. 
On wood associated with L. enteroleuca , Placodiznn , and Xylo- 
grapha. 
This differs from the specimens in the Herb. Tuck, in not having 
limiting hypothallus. Professor Tuckerman records its occurrence 
in New England, and suggests that it probably occurs throughout the 
United States and Canada. 
27. Lecidea platycarpa Ach. 
Lecidea platycarpa Acharius, L. U. 1810. 
Alaska (Trelease, 967) ; Hot Springs, Baranof Island (Trelease, 
983 in part) ; White Pass, 1250 ft. (Trelease, 965), 1925 ft. (Tre¬ 
lease, 955) ; summit of White Pass, 3000 ft. (Trelease, 954) ; Kadiak 
(Trelease, 897 in part, 902 in part, 914a) ; Port Wells (Trelease, 
