86 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
3. Bilimbia naegelii (Hepp) Zwackh, Flora 45: 505. 1862. 
Biatora naegeliti Hepp, Spor. Flecht. Eur. pl. 4.f. 1, 19. 18538. 
Thallus composed of granules somewhat coarser than in the last two and usually 
somewhat flattened to form a chinky or more or less irregularly roughened crust, this 
confined to suborbicular patches, 5 to 15 mm. or more in diameter, or widely scattered 
as a usually thin layer, commonly sea-green to ashy, but ours quite uniformly darker 
and even tending toward olivaceous; apothecia small, 0.2 to 0.9 mm. in diameter, 
scattered or more commonly numerous and more or less clustered, adnate or rarely 
sessile, flat and with thin exciple, or more commonly convex and immarginate, dark 
brown to black, said to be at first flesh-colored; hypothecium pale or pale brownish; 
hymenium pale throughout or brownish above; paraphyses simple or rarely branched, 
commonly thickened and darker toward the apex; asci clavate; spores fusiform-ellip- 
soid, commonly 4-celled, 18 to 25 » long and 3.5 to 5.5 » wide, said to be sometimes 6 or 
8-celled. 
Collected at Beaver Bay and at Granite Falls. The plant is usually difficult to 
detect, being easily passed over for some other species, and is doubtless quite generally 
distributed over the State. On trees. 
Known elsewhere in North America in Massachusetts and Florida. Common in 
Europe. 
Biatora naegelit of the preliminary reports. 
4. Bilimbia acclinis (Koerb.) Fink. 
Arthrosporum accline Koerb. Syst. Lich. 270. 1855. 
Thallus composed of minute granules, these commonly compacted into a rugose- 
verrucose or subleprose crust, in the few specimens seen covering small irregular or 
suborbicular patches of substratum, 6 to 14 mm. in diameter, sea-green to ashy, fre- 
quently disappearing; apothecia small or minute, 0.5 to 0.75 mm. in diameter, said 
to reach 1 millimeter, adnate, flat and having a thin exciple or becoming convex and 
immarginate, black, commonly scattered; hypothecium pale brownish; hymenium 
pale below and somewhat darkened above; paraphyses slender and frequently 
branched, commonly thickened and dark-colored above; asci clavate or inflated- 
clavate; spores becoming 4-celled, somewhat curved and usually plainly constricted 
at the septa, sometimes more than § in each ascus, 9 to 18 » long and 4 to 5 » wide. 
Collected at Gunflint, Battle Lake, and Thief River Falls. On trees. Another 
inconspicuous lichen, which doubtless occurs in other portions of the State. The 
species has been collected in northern Iowa and may be looked for in southern 
Minnesota. 
Elsewhere in North America in Massachusetts, New Hampshire, and Nebraska. 
Known also in Europe. 
Lecidea acclinis is the synonym under which the plant occurs in the preliminary 
reports, 
BACIDIA De Not. Giorn. Bot. Ital. 2: 189. 1846. 
The thallus is crustose and granulose, showing chinky, verrucose, or even sub- 
areolate or subsquamulose conditions. The margins in some of the best developed 
North American species are more or less lobulate, and the whole macroscopic structure 
only slightly inferior to that of the Lecideas and better developed than in Bilimbia. 
The thallus is frequently somewhat obscure, but seldom or never entirely disap- 
pears. Microscopically it is quite as rudimentary as in the two genera named above, 
and the algal symbiont is also apparently Cystococcus. The position and attachment 
to the substratum is likewise quite the same as in the closely related genera of the 
group. 
The apothecia are of about the same size as those of the Lecideas, reaching middle 
size, though small and minute forms are somewhat more common in the present 
