184 



the filaments, while others had the cells arranged in groups of four. 

 Intermediate forms showing constrictions in the single cells were 

 noticed, indicating process of division. Quite common m a 

 gathering from Bond Brook, Augusta. Dr. Young, 



87. Tetraspora Inbrica, var. lacwiosa^ Chaud. p. 1 9'* P'- 

 CLXV.— Sunk Haze Stream ten miles east of Oldtown. At- 

 tached to logs and stones in running water. Thallus sometimes 

 nearly a foot long and light-green. July and Aug. Common. 



88. Porphyridiuui criientum^ Naeg. p. 194, PI. CLXVI. — On 

 brick floor in the cellar of Coburn Hall, State College, Orono. 

 Oct. 



89. Rhaphidium polyniorpJuini, var. falcatiim (Corda), Rab. 

 p. 198, PI. CLX.— Augusta, July. (Dr. Young.) 



90. A', convolutwn (Corda), Rab. p. 198, PI. CLX.— Our 

 specimens occurred in spherical masses composed of 50 cells or 

 more. Bond Brook, Augusta. Dr. Young. 



"^ 



Family XVI. — Conjugatee. 



91. Spirogyra calospora^ Cleve, p. 209, PL CXXXIIh 

 Pool by roadside east of Oldtown toward Sunk Haze Stream. 

 Associated with the following and species of CEdogonium men- 

 tioned above. Well fruited but not abundant. Aug. 



92. 5. bellis (Hass.), Cleve, p. 217, PI. CXXXVH.— Asso- 

 ciated with above. Abundant and finely fruited. Fandorina 

 mornin and several desmids occurred in the same pool, dug to 

 get water for horses. 



93. PleiirocarpHs inirabilis, A. Br., p. 232, PI. CXLIX. — The 

 sterile form of this species is common, but its occurrence in fruit 

 is rare. The finding of a large mass of it finely in fruit is interest- 

 ing. Mr. VVolIe knew the form eight years before fruit was ob- 

 served and had not seen fruit-specimens since 1883, until we sent 

 them last summer. Mouth of a spring brook, tributary of Guagus 

 Stream, 40 miles northeast from Orono. July. The plant grew 

 in the still stream where the cold spring water emptied. There 

 was a mass of it, nearly ten feet each way. 



94. Stanrospermum viride. Kg. p. 234, PI. CL. — Guagus 

 Stream. July. Abundant. 



