Fink: LICHENS OF NORTHWESTERN MINNESOTA. 695 
ning, June 28, 1900, no. 339. Bemidji, July 5, 1900, nos. 464 
and 478, July 7, 1900, no. 529 and July 11, 1900, no. 651. 
Thief River Falls, July 18, 1900, no. 808, July 19, Ig00, no. 
811 and July 21, 1900, no. 847. Red lake, July 26, no. 888 
and July 28, 1900, nos. 935 and 969. 
Spores commonly smaller than Tuckerman’s measurements. 
98. Rinodina sophodes (Acu.) Nyw. var. atrocinerea Nyv. 
On tamarack in swamps, rare. Bemidji, July 6, 1g00, nos. 
538 and 547. 
Not previously reported from Minnesota. 
99. Rinodina sophodes (Acu.) Nyv. var. exigua Fr. 
On granitic rocks, rare. Battle lake, June 23, 1900, no. 
oa. Lear hills, June 26, 1900, no. ‘217. 
100. Rinodina bischoffi (HEpp.) Ksr. 
On calcareous rocks, rare. Leaf hills, June 27, 1900, no. 
201. 
101. Rinodina nigra sp. nov. 
On granitic rocks, infrequent. Battle lake, June 23, 1goo0, 
no. 146. 
Thallus thin (12-22 mm.), indeterminate or subdeterminate, 
tartareous-areolate, ecorticate; the areoles densely crowded, 
angular, .5-1.25 mm. wide, dark slate color; upon a black 
hypothallus, which also borders the thallus more or less; algal 
cells globose, green (Cystococcus?), 8-14 mic. in diameter. 
Apothecia minute, .25-.50 mic. in diameter, immersed in the 
thallus, one, two or three in each areole; disk black, usually 
somewhat depressed, circular, with an entire thalline exciple, 
concolorous with the thallus; hymenium 75-90 mic. deep. 
Spores brown, 2-celled, oblong and frequently somewhat con- 
stricted at the septum, 9-15 mic. long and 5-8 mic. wide, 8 in 
asci. Paraphyses distinct, slender, unbranched, colorless 
throughout or brownish at tips. Asci 50-60 by 13-17 mic. 
102. Pertusaria multipuncta (TuRN.) Nyv. 
On trees, frequent. Bemidji, July 13, 1900, no. 711 and 
July 14, 1900, nos. 723, 725 and 726. 
103. Pertusaria communis DC. 
On trees in swamp, frequent. Bemidji, July 13, 1900, nos. 
702 and 704. 
