80 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Collected at Harding on the northern boundary of the State. On rocks. 
A north American subspecies, known also from New Jersey, South Carolina, Iowa, 
and California, 
28b. Lecidea enteroleuca achrista (Sommerf.) Tuck. Syn. N. A. Lich. 2: 80. 1888. 
Lecidea elaeochroma achrista Sommerf. Suppl. FI. Lapp. 150. 1826. 
Thallus at first thin and smoothish, but becoming chinky or verrucose, whitish or 
rarely becoming dark-ashy; apothecia more inclined to remain flat and often becom- 
ing flexuous; hypothecium brownish yellow. 
Collected at Grand Portage, Granite Falls, Battle Lake, and Red Lake. On trees. 
Throughout the United States and northward into British America. Known also 
in Europe. 
28c. Lecidea enteroleuca fiavida Fr. Vet. Akad. Handl. 1822: 261. 1822. 
Thallus thin and smoothish, limited and variegated by black lines; apothecia some- 
times with a thin gray bloom; hypothecium yellow to brownish black. 
Collected at several points in the northwestern portion of the State. On trees. 
Found elsewhere in North America in New England and Alaska. Known also in 
Europe. 
28d. Lecidea enteroleuca pilularis (Dav.) Th. Fr. Lich. Scand. 2: 543. 1874. 
Lichen pilularis Dav. Trans. Linn. Soc. Lond. 2: 283, 1794. 
Thallus verrucose or areolate-verrucose, sea-green varying toward ashy, or even 
whitish,’ the verrucw frequently scattered or disappearing; hypothecium pale (or 
sometimes brownish in ours). 
Collected at Koochiching, at Tower, and on Flag Island in Lake of the Woods. 
Elsewhere in North America on the Rideau River and at Aylmer in Canada. 
Well known in Europe. 
Lecidea goniophila of the preliminary reports. In determining this again from the 
St. Peter sandstone at Minneapolis, the eminent authority, Dr. T. Hedlund, insists 
that L. goniophila (Floerke) Koerb, is distinct from L. enteroleuca Ach. We let the 
above disposition stand with this note, though Doctor Hedlund’s disposition is to be 
respected. 
28e. Lecidea entroleuca ambigua (Mass.) Tuck. Syn. N. A. Lich. 2: 80. 1888. 
Biatora ambigua Mass. Ric. Lich. 124. f. 242. 1852, 
Thallus thin and smoothish; apothecia brownish flesh-colored to blackish and 
thinly pruinose; hypothecium as above. 
Collected at several points in the northwestern portion of the State. On old wood. 
Elsewhere in North America in Washington and Oregon. Known also in Europe. 
29. Lecidea melancheima Tuck. Syn. Lich. N. E. 68. 1848. PuaTE 4, 
Thallus thicker, rough, wrinkled and verrucose, sea-green or ashy, usually irregu- 
larly spread over larger or smaller areas of the substratum, at first as a continuous crust, 
but the verrucze becoming more or less scattered and finally tending to disappear, 
possibly rarely subareolate; apothecia small to scarcely middle-sized, 0.5 to 1 mm. in 
diameter, adnate, frequently clustered and irregular, the disk very black, at first flat 
but becoming convex, the exciple soon disappearing and leaving the frequently shin- 
ing disk without margin; hypothecium pale (or in ours becoming brownish or brown); 
hymenium pale below and usually brownish above; paraphyses simple or sometimes 
branched, frequently more or less coherent, usually enlarged and darker toward the 
apex, asci clavate; spores oblong-ellipsoid, 7 to 12 « long and 3 to 4.5 fe wide. 
Lecidea elabens Fr. from Warroad, determined by Dr. T. Hedlund, scarcely differs. 
