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 n, 1900, no. 651. 

 Thief River Falls, July 18, 1900, no. 808, July 19, 1900, 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 (AcH.) NYL. var. atrocinerea NYL. 



On tamarack in swamps, rare. Bemidji, July 6, 1900, nos. 

 538 and 547. 



Not previously reported from Minnesota. 



99. Rinodina sophodes (Acn.) NYL. var. exigua FR. 



On granitic rocks, rare. Battle lake, June 23, 1900, no. 

 153. Leaf hills, June 26, 1900, no. 217. 



100. Rinodina bischoffi (HEPP.) KBR. 



On calcareous rocks, rare. Leaf hills, June 27, 1900, no. 

 291. 



101. Rinodina nigra sp. nov. 



On granitic rocks, infrequent. Battle lake, June 23, 1900, 

 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-^0 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 7590 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.) NYL. 



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. 



