94 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
exciple often more or less flexuous; hypothecium dark brown; hymenium pale, often 
with a brownish cast; paraphyses simple or rarely branched, commonly enlarged and 
brownish toward the apex; asci commonly clavate, but sometimes inflated-clavate or 
even tending toward cylindrical forms; spores brown, ellipsoid or oblong-ellipsoid, 
varying considerably in size, in ours 10 to 22 » long and 5 to 10 « wide, but such extreme 
sizes as 10 to 34 » long and 5 to 12 » wide credited to some of the European subspecies. 
Found throughout the State and common in the well wooded portions. On trees 
and dead wood. 
Generally distributed throughout North America. Known also in all the grand 
divisions, except possibly Asia. 
2a. Buellia parasema triphragmia (Nyl.) Th. Fr. Nov. Act. Reg. Soc. Sci. Ups. III. 
3: 327. 1861. 
Lecidea triphragmia Nyl, Mém. Soc. Sci. Nat. Cherb. 5: 126. 1857. 
Differs from the usual forms only in that the spores frequently show 3, 4, and even 
6-celled conditions. Some of the largest spores reported in Europe belong to this 
subspecies. 
Collected in the northeastern portion of the State at Gunflint and at Tofte. On 
trees. To be expected in any part of the State, but not common and easily overlooked 
in a macroscopic examination. 
Rarely reported in North America, but the wide separation of the few stations indi- 
cates that the subspecies may be looked for wherever the species exists. Known also 
in all the grand divisions, its occurrence in Asia making it almost certain that the 
usual form of the species also occurs there. 
3. Buellia dialyta (Nyl.) Tuck. Gen. Lich. 187. 1872. 
Lecidea dialyta Nyl. Flora 52: 123. 1869. 
Thallus thin or very thin, scurfy or granulose, or more or less compacted into a thin 
crust, white or ashy, irregularly spread over the substratum, said to rest upon a white 
so-called hypothallus; apothecia minute, 0.2 to 0.5 mm. across, sessile or adnate, the 
disk black and becoming slightly convex, the exciple thin and commonly disappear- 
ing; hypothecium dark brown; hymenium pale; paraphyses simple or rarely com- 
pound, frequently enlarged and brownish toward the apex; asci clavate; spores 
brown, fusiform-ellipsoid, 19 to 31 » long and 7 to 11 « wide. 
Collected on pines at Two Harbors. Easily passed over for a condition of the last 
above. 
Elsewhere in North America in New England, New York, and California. Not 
known in other grand divisions. 
4. Buellia myriocarpa (Lam. & DC.) Mudd, Man. Brit. Lich. 217.1861. Ficure 11. 
Patellaria myriocarpa Lam. & DC. FI. Fr. ed. 3. 2: 346, 1805. 
Thallus thin and scurfy or compacted into a smoothish or chinky crust, this 
irregularly spread over small areas of the substratum and frequently becoming rough- 
ened-verrucose, sea-green, ashy, or even white, often disappearing; apothecia minute, 
0.2 to 0.6 mm. in diameter, adnate, often numerous, the disk black and flat, or becom- 
ing somewhat convex, the exciple also black, thin, and often disappearing; hypothe- 
cium dark brown; hymenium pale, or pale below and brownish above; paraphyses 
simple or branched, usually enlarged and brown toward the apex; asci clavate; 
spores brown, ellipsoid or oblong-ellipsoid, sometimes slightly constricted at the 
septum, 7 to 15 » long and 4 to 7.5 » wide. 
Generally distributed over the State. On trees and old wood. 
Widely distributed in North America. Also known in all the grand divisions except 
Africa. , 
