FINK—THE LICHENS OF MINNESOTA. 79 
Collected at Taylors Falls and in the Misquah Hills. On rocks. 
Found in the Appalachian Mountains from Alabama northward as far as Newfound- 
land and in Alaska. Known also in Europe and Asia. 
26. Lecidea cyrtidia Tuck. Proc. Amer, Acad, 12: 181. 1877. 
Thallus composed of very minute scattered or sometimes crowded, scurfy granules, 
sea-green or more commonly varying toward greenish or olivaceous, the whole struc- 
ture very inconspicuous and irregularly, frequently widely, spread over the sub- 
stratum; apothecia also minute and closely adnate (so that the plant is frequently 
difficult to detect), 0.2 to 0.5 mm. in diameter, the disk black, at first flat but soon 
becoming convex, the exciple thick and black, but soon disappearing; hypothecium 
rather thick, pale, or more commonly brown; hymenium pale below and brownish 
above; paraphyses simple or rarely branched, sometimes more or less coherent, com- 
monly enlarged and brownish toward the apex; asci clavate; spores ovoid-ellipsoid, 
5 to 9 » long and 2 to 4 » wide. 
Collected near Snowbank Lake and at Rainy Lake City, thus on or near the northern 
boundary. On rocks. 
A North American species known in New England, Illinois, and Missouri. 
27. Lecidea platycarpa Ach. Lich. Univ. 173. pl. 2. f. 5, 1810. 
Thallus thin, more or less chinky and finally subareolate, sometimes becoming 
wrinkled, sea-green to ashy, or tinged red by iron, irregularly spread over the sub- 
stratum as a continuous or more commonly as a more or less broken crust, and tre- 
quently for most part or entirely disappearing; apothecia small to middle-sized or 
even larger, 0.5 to 1.5 mm. in diameter, or larger in foreign specimens, usually scat- 
ered, sessile or adnate, the disk flat or becoming somewhat convex, black or brownish, 
rarely slightly pruinose, rounded or becoming somewhat irregular, the exciple thickish 
and becoming more or less flexuous and disappearing; hypothecium thick and blackish 
brown; hymenium pale below and pale brownish above; paraphyses simple or rarely 
branched, commonly somewhat enlarged and brownish toward the apex; asci clavate; 
spores ovoid-ellipsoid, 11 to 18 » long and 5 to 9 » wide. 
Reported from the Misquah Hills and from Blueberry Island in Lake of the Woods, 
though the material from the former locality will doubtless have to be placed elsewhere 
eventually. On rocks. 
Elsewhere in North America in New England, New York, Virginia, North Caro- 
lina, Ohio, and South Dakota. Known also in South America and Europe. 
28. Lecidea enteroleuca Ach. Lich. Univ. 177. 1810. 
Thallus commonly rather thin, smoothish, or more often variously chinky, areolate; 
the granules or verruce rarely becoming heaped and the thallus then thicker, this sea- 
green varying toward ashy, suborbicular, or variously irregular and more widely 
spread over the substratum, the more rounded thalli commonly 15 to 65 mm, across, 
apothecia minute to scarcely middle-sized, 0.3 to | mm. in diameter in ours, adnate, 
the disk black and soon becoming more or less convex, the exciple soon flexuous and 
disappearing; hypothecium pale to dark brown; hymenium pale below and more 
or less darkened above; paraphyses simple or sometimes branched, frequently more 
or less coherent, usually enlarged and brownish toward the apex; asci clavate, the 
apical wall more or less thickened; spores ovoid-ellipsoid, 8 to 17 4 long and 5 to 9 # 
wide. 
Generally distributed over the State, and often appearing as one of the subspecies 
below. On trees, old wood, and various rocks. 
Distributed throughout North America. Known also in all of the grand divisions. 
28a. Lecidea enteroleuca theioplaca Tuck. Gen. Lich. 179. 1872. 
Thallus verrucose, pale yellowish; hypothecium dark and blackening; thallus with 
a greenish yellow cast in ours. 
