187 



truncate. Associated with the tvoe form but less common. 



Form somewhat 



Swamp back of college woods. July. 



123. X. asteptum, Nord., p. 93^ PL XXL— 

 broader than Wolle's figure but shape and arrangement of spines 

 the same. Swamp back of college woods. Aug. 



124. X. fascictdatum^ var. subalpinum, WoUe, F. W. A., p. 

 34. PI. LVL— With the above. Aug. 



125. X. atttilopcBum^ var. polymazwn^ Nord. p. 94, PL 

 XXIIL With the above. July. 



126. Arthrodesnius snhiilatus^ Kg. p. 96, PL XXIV. — Swamp 

 back of college woods. July, 



127. A. inais, var. deprcssa, Wolle, p. 97, PI .XXIV, — Frog 

 pond, Orono. July. Form only 9 // diameter. 



128. A, octicornis, Ehrb., p. 97, PL XXIV.— Bond Brook, 

 Augusta. Collected by Dn Young. July. 



129. Etiastrtcm oblongiim (Grev.), Ralfs, p. 98, PL XXV. 

 Pool by roadside west of Orono. June. Also swamp back of 

 college woods. Au<r. 



Swamp back 



130. E, pinnatufHy Ra 

 of college woods. Aug. 



131. E. htimerosnm, Ralfs, p. 99, PL XXXIIL— Pool by 

 roadside west of Orono. June. 



132. E, ansattiiu (Elirb.\ Ralfs, p. 99, PL XXIX. — Swamp 

 hack of college woods. Au 



"^11^ E, 



cr 



Moosehead 



Lake in gathering by Dr. Young. July. 



134- ^- urna/br7^ie, Wolle, p. lOO, PI. LI I. -Moosehead Lake 

 (Dr. Young). 



135- ^. rostratum, Ralfs, p. io6, PI. XXVII.— Roadside 

 pool west of Orono. June. 



136. Micrasterias truiicata (Corda), Ralfs, p. 114, PI 

 XXXVIII. — Swamp back of college woods and pool west of 

 Orono. Our specimens were 100 // diameter and had the ends 

 well rounded. Common. Aug. 



137- M, Jenneri, Ralfs, p. 115, PL XXXIIL— With the 

 above. Aug. 



138. M. pinnatifida (Kg.), Ralfs, p. 116, PI. XXXVIII 

 Spring west of college (L. H. Merrill). May. 



