76 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
16. Lecidea flavidolivens (Tuck.) Fink. 
Biatora flavidolivens Tuck. Syn. N. A. Lich. 2: 28. 1888, 
Thallus composed of minute, irregular, and usually crowded and heaped, greenish to 
yellowish brown granules, these forming a commonly widespread continuous or some- 
what scattered crust; apothecia minute, olivaceous to black in ours, 0.2 to 0.3 mm. in 
diameter, adnate or immersed, flat, with a pale exciple, or becoming convex and the 
exciple disappearing; hypothecium brownish or brown; hymenium pale or pale 
bluish; paraphyses simple, but more or less gelatinized and coherent; asci broadly 
clavate; spores simple or rarely 2-celled, 7 to 14 » long and 3 to 4 » wide. 
Collected at Warroad. Ona cedar stump inaswamp. The plant so reported from 
Rat Lake seems nearer the next. Tuckerman’s plant had not the black apothecia 
and its spores are somewhat larger. 
A North American lichen, elsewhere only known at New Bedford, Massachusetts. 
Biatora flavidolivens of the preliminary reports. 
17. Lecidea lucida Ach. Meth. Lich. 74. 1803. 
Lichen lucidus Ach. Lich. Suec. 39. 1798. 
Thallus composed of minute granules commonly breaking up into a fine, powdery 
crust, this usually widely spread over the substratum as a greenish yellow, con- 
tinuous or more or less scattered, rather thin layer, or rarely more or less collected into 
little heaps; apothecia adnate, small to minute, 0.15 to 0.35 mm. in diameter, more 
or less convex, pale or darker lemon-color, passing into brownish, sometimes clustered 
or conglomerate, the exciple evanescent; hypothecium and hymenium pale yellow- 
ish; paraphyses commonly simple, but somewhat gelatinized, coherent and indistinct; 
asci clavate; spores oblong-ovoid, 4 to 7 « long and 2 to 3 » wide. 
Widely distributed in northern Minnesota. On shaded rocks. 
Elsewhere in North America known from New York, Massachusetts, and arctic 
America. Found also in Europe. 
Biatora lucida of the preliminary reports. 
18. Lecidea oxyspora (Tul.) Nyl. Act. Soc. Linn. Bord. 21: 391. 1856. 
Abrothallus orysporus Tul. Ann. Sci. Nat. Bot. IIT. 17: 116. pl. 16. f. 27. 1852. 
Thallus evanescent or not distinguishable from that of the host, the latter deformed 
by the parasite and passing into small tufts of irregular or cucullate lobules; apothecia 
minute, 0.15 to 0.3 mm. in diameter, flattish or slightly convex, more or less immersed 
in the deformed thallus of the host, pale brown to black, without exciple; hypothe- 
cium pale brownish to brown; hymenium pale throughout or brownish above; 
paraphyses usually simple, commonly enlarged and brownish toward the apex; asci 
clavate; spores ellipsoid to fusiform, 15 to 20 « long and 5 to 7.5 » wide. 
Generally distributed throughout the northern portion of the State. On Parmelias * 
and especially common on P. borreri on cedars in swamps. 
Known elsewhere in North America from New England, Canada, and Ontario. 
Found in all of the grand divisions except Africa. 
Biatora oxyspora of the preliminary reports. 
19. Lecidea lapicida Fr. Lich. Eur. 306. 1831. 
Thallus more or less roughened, verrucose to areolate, sea-green or becoming more 
or less ash-colored, the areoles or verruce about 0.5 to 1.75 mm. across, irregularly and 
often quite widely spread over the substratum as a rather thin crust; apothecia small, 
0.3 to 1 mm. in diameter (said to become middle-sized), adnate or more or less im- 
mersed, sometimes clustered, the disk black and commonly flat, but frequently 
becoming convex and irregular, the exciple black and raised or finally disappearing; 
hypothecium usually dark brown; hymenium pale or more or less bluish below and 
darker above; paraphyses simple or rarely branched toward the commonly enlarged 
and darker apex; asci clavate; spores short-ellipsoid, 8 to 12 ~ long and 4 to 7 » wide. 
Collected in the northern part of the State at Emo, at Rainy Lake City, and in the 
Misquah Hills. On rocks. 
