160 



■ 



46. E, verriicositm^ var. simplex^ Joshua. — This form is new 

 to the U. S. In a paper dated February, 1885, Wm. Joshua, 

 F, L. S., Eng.j describes this variety from specimens collected at 

 Pictou, Canada. His diagnosis is as follows: '* Of stout habit, 

 terminal lobes very short and with very shallow incisions, central 

 inflation either none or very small ; no other. Length, 85 /^; 

 width, 65 // ; apical lobes, 35 fx wide'; thickness, 25 //." 



The nearest form to this variety is Cos^nariiim trilobatulunty 

 Reinsch, but not smooth hke it, and somewhat larger. It is 

 granular throughout, but most densely at the angles of the lobes. 

 It appears to stand on the border between Eziastriim and Cos- 



marium. 



Shallow pools along the Penobscot at Old Town, Great Works 

 and Orono. Sparingly in the water of springs and sphagnum 

 swamps. Associated with the type form. 



47. E, elegans, Kg., p. 106, PI. XXVIL— In gatherings 



from Great Works (Merrill). Also in shallow pools and ponds, 

 Orono. 



48. E. binale (Turpin), Ralfs, p. 107, Pi. XXVIL— Associ- 

 ated with the above. 



49. Micrasterias rotata (Grev.), Ralfs, p. 109, PI. XXXI V. 

 From gathering w^hich stood in laboratory two months. Penob- 

 scot, near Orono. 



50. M. denticidata (Breb.), Ralfs, p.. 109, PI. XXXIV. 

 With the above. 



51. M. Americana (Ehrb.), Kg., p. 112, PI. XXXII.— From 

 old well on college farm, Orono. 



52. Staurastrum Avictila, Breb., p. 123, PL XL. — Old well, 

 college farm, Orono. 



53. 5. polymorphttm, Breb., p. 126, PL XLIL— Old well, 

 college farm ; also in stagnant water of small ponds ; common. 



54. S. crenulattim (N^g.), Delp., p. 126, PL XLIL— Old 

 well, college farm; also in many ponds about Orono; common. 



55. S. p2inctulat2im, Brth., p. 127, PI. XLI. — Potholes 

 Penobscot; also in shallow pools, Orono. 



56. S, pygviceum, Breb., p. 128, PL XLIL — From the gath- 

 ering^taken near the Penobscot that stood in the laboratory tw^^ 

 months. 



in 



