1905] Collins, Phycological Notes of Isaac Holden 227 
E. confervoides forma brumalis Holden. 542, 548, 1442 = P. B.— 
A. 576. On Spartina, stubble, etc., between tides, nearer high water 
mark, Seaside Park and Charles Island. Dec. Jan. “Extreme 
breadth of cells about 25 »; plurilocular sporangia of various lengths 
up to 150 p or more, and in width up to 25 m; fronds mostly one or 
two cm. in height. I have never seen this form except in winter, 
mostly about Xmas time.” 
E. reptans Crouan? 650. On Zostera, Black Rock. July. 
E. siliculosus (Dillw.) Ag. 1032, 1262, 1341. Black Rock Beacon;. 
Fresh Pond ; Cook's Point. May, Aug., Nov. 
E. subcorymbosus Farlow.’ 703, 720, 1230, 1340 =P. B.-A. 
415. On Ruppia, with Enteromorpha, etc., Fresh Pond; in muddy 
pools, Cook's Point. Aug.-Nov. “About 1 mm. high; cells about 
12 por a little more in diameter, 2-4 times as long. Branching alter- 
nate or opposite. When opposite the main filament often prolonged 
into a very long hyaline hair from the point of branching. Such a 
hair also frequently taking the place of a branch or forming the pro- 
longation of an ordinary filament or branch. Plurilocular sporangia 
18-25 u wide, 60-100 p long, terminal or lateral, the latter generally 
with a short stipe of 1-3 cells. Filaments much crowded at base, 
where they (and also hairs) spring from an almost parenchymatous 
mass. ” 
Ascocyclus orbicularis (J. Ag.) Magnus. 874, 1521. On Zostera 
Yellow Mill Pond; Pleasure Beach. July, Sept. 
Sphacelaria radicans (Dillw.) Ag. 149, 177, 880. Stratford Shoal, 
on rocks between tides; Seaside Park, on turfy bottom. Sept.—Nov. 
S. cirrhosa (Roth) Ag. 510, 535. Seaside Park, on Fucus and 
Polysiphonia. Nov., Dec. 
Desmotrichum undulatum (J. Ag.) Reinke. 575, 1100, 1104, 1252. 
Seaside Park, on Zostera, with Halothrix. Apr. May.  Plurilocular 
sporangia, May. 
D. Balticum Kütz. With D. undulatum, Seaside Park, with pluri- 
locular sporangia, May. 
Punctaria latifolia Grev. 812, 930, 931 =P. B.-A. 82, 936, 1111, 
1192, 1248, 1250. Cook’s Point; Seaside Park; on shells and Zos- 
tera. Apr., May. 
1 This quite distinct species has long been in the unsatisfactory position of a 
species distributed under a manuscript name but never published. Mr. Holden’s 
excellent description may well be used to place it on a more stable basis.— F. S. C. 
