328 Minnesota Algae 



PLATE XIX. 



Fig. I. Dichothrix meneghiniana (Kuetz.) De Toni. (After Wolle) 



Fig. 2. Dichothrix gypsophila (Kuetz.) Born, and Flah. (After Engler 



and Prantl) 



Fig. 3. Dichothrix hosfordii (Wolle) Bornet. (After Wplle) 



Fig. 4. Sacconema rupestre Borzi. (After Engler and Prantl) 



Fig. 5. Isactis plana (Harv.) Thur. (After Bornet and Tliuret) 



Fig. 6. Rivularia pisum Ag. (After Cooke) 



Fig. 7. Rivularia natans (Hedw.) Welw. (After Teodoresco) 



PLATE XX. 



Fig. 1-3, Rivularia natans (Hedw.) Welw. (Original) 



Fig. 4. Rivularia echinulata (Smith) Born, and Flah. (After Xemmer- 



mann) 

 Fig. 5, 6. Rivularia polyotis (Ag.) Bornet and- Flah. (After Bornet and 



Thuret) 

 Fig. 7-8. Rivularia borealis P. Richter. (After Richter) 

 Fig. 9. Rivularia minutula (Kuetz.) Born, and Flah. (After West) 

 Fig. ID. Rivularia atra Roth. (After Wille) 

 Fig. 11-14. Rivularia haematites (DC) Ag. (Original) 

 Fig. 15. Rivularia dura Roth. (After Cooke) 



Fig. 16, 17. Rivularia coadunata (Sommerf.) Foslie. (After West) 

 Fig. 18. Brachytrichia quoyi (Ag.) Born, and Flah. (After Gomont) 

 Fig. 19, 20. Asterothrix creginii Wolle. (After Wolle) 

 Fig. 21. Asterocytis ramosa (Thwaites) Gobi. (After Wille) 

 Fig. 22. Glaucocystis nostochinearum Itzig. '(After Lagerheim) 

 Fig. 23. Forphyridium cruentum. (Ag.) Naeg. (After Cooke) ' 

 Fig. 24, 25. Cryptoglena americana Davis, ' (After Davis) 



