326 Minnesota Algae 



Fig. 10. Microchaete tenuissima W. and G. S. West. (After W. and G. 



S. West) 

 Fig. II. Microchaete tenera Thur. (After Bornet and Thuret) 

 Fig. 12. Microchaete grisea Thur. (After Bornet and Thuret) 

 Fig. 13. Hormothamnion enteromorphoides Grun. (After Engler and 



Prantl) 



PLATE XL 



Fig. I, 2. Plectonema tenue Thur. (After Gomont) 



Fig. 3. Plectonema tomasinianum (Kuetz.) Born. (After Bornet and 



Thuret) 

 Fig. 4, 5. Plectonema wollei Fart. (After Gomont) 

 Fig. 6. Plectonema terebrans Born, and Flah. (After Bornet and Fla- 



hault) 

 Fig. 7. Plectonema nostocorum Born. (After Gomont) 

 Fig. 8. Plectonema roseolum (Richter) Gom. (After Gomont) 

 Fig. 9. Plectonema golenkinianum Gom. (After Gomont) 

 Fig. 10. Plectonema calotrichoides Gom. (After Gomont) 

 Fig. II, 12. Scytonema rivulare Borzi. (Original) 

 Fig. 13, 14. Scytonema occidentale Setchell. (After Setchell) 

 Fig. 15. Scytonema crispum (Ag.) Born. (Original) 



PLATE XII. 



Fig. I. Scytonema caldarium Setch. (After Setchell) 



Fig. 2, 3. Scytonema azureum Tilden. (Original) 



Fig. 4. Scytonema hofmanni Ag. (After Engler and Prantl) 



Fig. 5. Scytonema varium (Kuetz.) (After Kuetzing) 



Fig. 6. Scytonema javanicum (Kuetz.) Born. (After W. and G. S. West) 



Fig. 7. Scytonema javanicum var. hawaiiense Lemmermann (After Lem- 



mermann) 

 Fig. 8. Scytonema ocellatum Lyngb. (After Wolle) 

 Fig. 9. Scytonema intertextum (Kuetz.) Rab. (After Wolle) 

 Fig. 10, II. Scytonema amplum W. and G. S. West. (After W. and G. 



S. West) 

 Fig. 12. Scytonema wolleanum De Toni. (After Wolle) 

 Fig. 13, 14. Scytonema stuposum (Kuetz.) Born. (After Kuetzing) 



PLATE XIII. 



Fig. I. Scytonema tolypotrichoides Kuetz. (After Wood) 



Fig. 2-S. Scytonema mirabile (Dillw.) Born. (After West) 



Fig. 6. Scytonema myochroum (Dillw.) Ag. (After Bornet and Thuret) 



Fig. 7, 8. Scytonema fuliginosum Tilden. (Original) 



Fig. 9. Scytonema alatum (Carm.) Borzi. (After Hone) 



Fig. 10-12. Scytonema crustaceum Ag. (After Kuetzing) 



Fig. 13. Scytonema densum (A. Br.) Born. (After Kuetzing) 



Fig. 14. Symphyosiphon'bornetianum Wolle. (After Wolle) 



Fig. 15. Scytonema hirtulum (Kuetz.) Rab. (After Wolle) 



PLATE XIV. 



Tolypothrix lanata (Desv.) Wartm. (After West) 

 I. Tolypothrix distorta (Hofman-Bang) Kuetz. (Original) 

 Tolypothrix penicillata (Ag.) Thur. (After Engler and Prantl) 

 Tolypothrix byssoidea (Hass.) Kirchn. (After Cooke) 

 Tolypothrix ravenelii Wolle. (After Wolle) 

 Tolypothrix setchellii Collins. (After Collins) 

 Tolypothrix rupestris Wolle. (After Wolle) 

 Desmonema wrangellii (Ag.) Born, and Flah. (After Engler and 



Prantl) 

 Diplocolon heppii Naeg. (After Engler and Prantl) 

 Mastigocoleus testarum Lag. (After Engler and Prantl) 



