_' 4 I I >LLINS \\D ill i;\ ) \ . 



*2. S. calcicola Rabenhorsl exGomont, 1893, p. r>, PL VIII, 



figs, l 3; P. B.-A., No. 2158. On shaded wall of bouse near South 



Road, I Vc, ( lollins. 



Famtlt NOSTOCH \< :eae. 

 Anabaena Boiy. 



l. Spores ovoid, not contiguous to heteroc] l. A. variabilis. 



1. Spores subcylindrical, contiguous to heterocyi 2. A. tarulosa. 



*1. A. variabilis Kutzing ex Hornet & Flahault, 1888, p. 226, 

 P. B.-A., No. 2059. Sphaerozyga Thwcdterii Harvey, 1846 51, PI. 

 < XIII. B. Brackish pool, April. Collins; in reservoir near Spanish 

 Rock, Jan., Ilervev. In the material from the latter station the 

 filaments were sometimes straight, but oftener curved as in A. 

 aquae Bret). ; the spores were those of A. variabilis. 



2. A. TORULOSA Lagerheim ex Bornet cV Flahault, 1SSS, p. 236. 

 Among other algae, North Shore, Aug., Collins. 



Sterile filaments of an Anabaena or Cylindrospermum were found on 

 ground wet by rain, near Flatts Pridge, Aug., Collins. The cells 

 were about 4 u diam., spherical, or just after division discoid. 



HORMOTHAMNION Grunow. 



H. convolutum sp. nov. Trichomatibus pallide aerugineis, in- 

 terduxn rubescentibus, parallelis, elongatis, 3-t5 /z diam.; cellulis 1 I 

 diam. longis, cylindricis, nodis leviter constrictis; heterocystis ovoi- 

 deis vel sphaericis, 8-10/1 diam.; sporis ?; fasciculia tenuibus, inter 

 utriculis hospitis penetrantihus, curvatis. 



Trichomes pale aerugineous, sometimes with a shade of red, parallel, 

 long, 3-5/* diam.; cells 1-1 diam. long, cylindrical, slightly constricted 



at the node-; heteroeysts ovoid to Spherical, 8 10 M diam.; spOTK 



fascicles slender, winding among the utricles of the host. On ('odium 

 (omerUosum, Cooper's Island, Aug. 29, L913, F. S. Collins. Type in 

 Collins herb., No. 7239. 



More -lender than the other species of the genus, the cells relatively 

 longer. The cluster of*filaments winds about among the utricL 



the host, the continued growth of the two plants Causing the endophx te 

 to turn and twist very sharply. 



