78 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
22a. Lecidea contigua convexella (Wainio) link. 
Lecidea crustulata converella Wainio, Act. Soc. Faun. Flor. Fenn. 10: 74. 1883. 
Form with apothecia commonly becoming convex and the exciple disappearing. 
Collected at Grand Marais and not previously reported from Minnesota. On rocks, 
Not known elsewhere in North America. Found also in Europe. 
23. Lecidea lactea (Flot.) Schaer. Lich. Helv. Spic. 8: 127. 1828. 
Lecidea petraea lactea Flot. Flora 2: 692. 1828. 
Thallus ashy, varying toward whitish or sea-green, of moderate thickness, at first 
smooth, but becoming more or less roughened and chinky or areolate, suborbicular or 
somewhat irregular, commonly 35 to 75 mm. across, forming a continuous layer and 
sometimes becoming thicker in ours; apothecia small to middle-sized or larger, 0.4 
to 2.5 mm. in diameter, immersed or rarely becoming adnate, the disk black and 
commonly flat, the exciple thin and frequently disappearing; hypothecium brown 
or brownish; hymenium pale or pale brownish below and somewhat darker above; 
paraphyses commonly simple, frequently more or less coherent, sometimes enlarged 
and darker above; asci clavate or cylindrico-clavate; spores ellipsoid, 9 to 14 # long 
and 4 to 6 » wide. 
Collected at several localities on the north shore of Lake Superior. On rocks. 
Apparently not reported elsewhere in North America. Known in all of the grand 
divisions. 
24. Lecidea speirea Ach. Meth. Lich. 52. 1803. PuaTE 6, A. 
Lichen speireus Ach. Lich. Suec. 59, 1798. 
Thallus white, or whitish-ashy and sometimes mealy, smoothish and chinky or 
becoming areolate or subareolate, scarcely as thick as that of the last above, usu- 
ally in smaller patches than in the last and commonly irregular, about 15 to 50 mm. 
across, sometimes becoming rougher; apothecia small in ours, but said to reach more 
than middle size, immersed or becoming adnate, the disk black and commonly flat, 
but sometimes finally convex, the exciple black or whitish-pruinose, frequently dis- 
appearing; hypothecium brown or dark brown; hymenium commonly pale below and 
darker above; paraphyses commonly simple, frequently more or less coherent, com- 
monly enlarged and darker toward the apex; asci clavate; spores ellipsoid, 9 to 14 
long and 5 to 8 » wide. 
Collected with the last along the north shore of Lake Superior, where the two occur 
on the rocks, usually from the water line back not more than 5 meters. 
Known in New England and from the north shore of Lake Superior in Ontario, 
Found also in Europe and Africa. 
EXPLANATION OF PLATE 6.—A, Plants of Lecidea speirea on rocks, showing the thallus and the 
apothecia. B, Plants of Lecidea albocaerulescens on rocks, showing the crustose thallus and the apothecia, 
A enlarged 14 diameters; B natural size. 
25. Lecidea albocaerulescens (Wulf.) Schaer. Lich. Helv. Spic. 3: 142. 1828, 
PLATE 6, B. 
Lichen albocaerulescens Wulf. in Jacq. Coll. Bot. 2: 184. pl. 15. f. 1. 1788. 
Thallus commonly thinner than those of the last two, rather smoothish, more or 
less chinky and sometimes becoming obscurely small-areolate, ashy or varying toward 
whitish, sea-green or even olivaceous, spread over the substratum as a continuous 
crust, suborbicular or irregular and often covering quite large areas; apothecia small 
to middle-sized, 0.5 to 1.5 mm. in diameter, or 2 mm. or more in foreign material, 
adnate or rarely somewhat immersed, rounded or becoming irregular, the disk black 
or brownish black, usually flat, almost always more or less whitish-pruinose, the 
exciple black, seldom if ever disappearing; hypothecium brown to brownish black; 
hymenium commonly pale; paraphyses simple or rarely branched, somewhat cohe- 
rent, commonly enlarged and darker toward the apex; asci clavate or inflated-clavate; 
spores ovoid-ellipsoid, 15 to 24 » long and 7 to 10 » wide. 
