1905] Collins, Phycological Notes of Isaac Holden 223 
Plectonema terebrans Born. & Flah. 861, 869. In marine shells 
with other algae, Harbor. Sept., Oct. 
Hydrocoleum glutinosum (Ag.) Gomont. 664=P. B.-A. 453, 1033. 
On iron piles, Black Rock Beacon. July, Aug. 
H. Holden Tilden. 1194, 1195, 1326, 1367 =P. B.—A. 602, 1464. 
“Forming a gelatinous tubular coating around old stems of Spartina 
in a brackish ditch.” Cook’s Point. May, Sept. 
Microcoleus chthonoplastes (Fl. Dan.) Thuret. 881, 1508. Seaside 
Park, forming a thick coating on turf near high water mark; Cook’s 
Point, in sheets, on sandy bottom between tide marks. Sept., Oct. 
Anabaena torulosa (Carm.) Lagerh. 339, 1119. On mud on mar- 
gin of marsh pools, Cook’s Point; on muddy sand, near high water 
mark, among Spartina, shore of The Gut. June. 
A. variabilis Kütz.. 704, 709. With Oscillatoria princeps Vauch, 
etc., Fresh Pond. Aug. 
Nodularia spumigena var. major (Kütz.) Born. & Flah. 1458, 1459, 
1460, 1461. Marsh pool, Cook’s Point, filaments scattered among 
Lyngbya, Hydrocoleum, etc., May 14. “No spores observed.” May 
20. “No spores yet.” May 28. ‘Spores have appeared, proving 
var. y major Bornet & Flahault.” 
Microchaete grisea Thuret. 765. On stranded stump, Seaside 
Park. Nov. 
Mastigocoleus testarum Lagerh. 7094, 861. In shells, Fresh Pond. 
Aug., Sept. 
Amphithrix violacea (Kiitz.) Born. & Flah. 756. On stones, Fresh 
Pond. Nov. 
Calothrix aeruginea (Kütz.) Thuret. 7323, 1034. Forming a coating 
with Enteromorpha sp. on iron piles between tide marks, Black Rock 
Beacon. Aug., Oct. 
C. confervicola (Roth) Ag. 703. On Ruppia, Fresh Pond. Aug. 
C. crustacea "Thuret. 155, 482, 483, 636 = P. B.-A. 10, 641, 714, 
724. On algae and rocks, Stratford Shoals; Woodmont; Cook's 
Point. July, Sept., Oct. 
C. parasitica (Chauvin) Thuret. 1127a. On Nemalion multifidum, 
Stratford Shoals. July. 
C. pulvinata (Mert.) Ag. 147, 487,967. On woodwork at or above 
high water mark, Black Rock ; Stratford Shoals ; on old hulk, Cook's 
Point. Aug. Oct. 
C. scopulorum (Web. & Mohr) Ag. 153, 1128. On rocks, Strat- 
ford Shoals. July, Sept. 
