708 MINNESOTA BOTANICAL STUDIES. 
201. Staurothele umbrina Waunt.)Tuck. var. colpima(WHNBL.), 
NYyL. 
On granitic rocks in damp places and usually near water, 
locally common. Bemidji, July 11, 1900, nos. 593, 636, 641 
and 642. 
This plant was recorded in no. IV. of this series of papers 
and also in no. V. as SS. drummondiz Tuck. However, it 
agrees more nearly with European specimens of the present 
variety. 
Not previously reported from Minnesota. 
202. Verrucaria nigrescens PERs. 
On rocks, frequent. Battle lake, June 20, 1900, nos. 86 
and 87 and June 23, 1900, nos. 144 and 168. Leaf hills, July 
2, 1900, nos. 387 and 403. Thief River Falls, July 17, 1900. 
no. 754. Red lake, July 27, 1900, no. 929 and July 28, 1900, 
no. 947. 
203. Verrucaria viridula Acu. 
On rocks along lake, common. Red lake, July 28, 1900, 
no. 943. 
Not previously reported from Minnesota. 
204. Verrucaria muralis Acu. 
On rocks, especially calcareous, infrequent. Battle lake, 
June 23, 1900, no. 166. Leaf hills, June 27, 1900, nos. 289 
and 293 and July 2, 1900, no. 404. Red lake, July 28, 1900, 
no. 940. 
205. Verrucaria fuscella Fr. 
On calcareous drift pebbles, frequent. Leaf hills, June 27, 
1900, nos. 262 and 297. 
A peculiar form. 
206. Verrucaria conoidea Fr. 
On lime pebbles, rare. Bemidji, July 11, 1900, no. 626. 
Not previously reported from Minnesota and probably new to 
North America. 
207. Lagedia oxyspora (Nyu.) Tuck. 
On birch trees, probably abundant. Henning, June 25, 1900, 
no. 189. Bemidji, July 11, 1900, no. 608 and July 12, 1900, 
no. 671. 
208. Pyrenula punctiformis (AcH.) Nake. 
On trees, rare. Battle lake, June 18, 1900, no. 18. 
