72 COLLINS AND HERVET. 



AscocTCLUS Magnus. 



A. ORBICULARIS (J. Ag.) Magnus, 1874, p. 73; P. B.-A., No. 1878; 

 Myrionema orbiculare J. G. Agardh, 1848, p. 48. On marine phanero- 

 gams in shallow water. Cooper's Island, April, Collins. Probably 

 elsewhere, but easily overlooked. 



Family SPHACELARIACEAE. 

 Sphacelaria Lyngbye. 



1. Propagula with broad body. 2. 



1. Propagula slender, branching. 3. 



2. Filaments mostly 30-40 yx diam. ; lateral cell of propagulum not divided. 



3. S. tribuloides. 



2. Filaments mostly 55-75 /x diam. ; lateral cell of propagulum divided into 



two. 4. S. novae-hoUandiae. 



3. Propagulum with three rays from summit of pedicel. 2. S. fusea. 



3. Propagulum with two rays from summit of pedicel. 1. S. furcigera. 



1. S. FURCIGERA Kiltzing, 1855, p. 27, PL CX; Sauvageau, 1901,^ 

 p. 145, fig. 35. On small spider crab. Hungry Bay, July, on floating 

 Turhinaria, Dec, Collins; with propagula. 



2. S. ruscA (Huds.) Agardh, 1828, p. 28; Sauvageau, 1902, p. 206, 

 fig. 43 ; Conferva fusca Hudson, 1798, p. 602. Spanish Rock, April, 

 Hervey, with propagula. 



3. S. TEiBTJXOiDES Meneghini, 1840, p. 2; Sauvageau, 1901, p. 123, 

 figs. 28-29; P. B.-A., No. 1923. Not imcommon in shallow rock pools 

 and on various submerged substances. In pools, South Shore, Far- 

 low; Harris Bay, Feb., March, Dec, Gravelly Bay, Jan., Hervey; 

 on Galaxaura, St. David's, April, Collins. Found once on twigs of 

 Tamarisk that drooped into the water of Harrington Sound. Propa- 

 gula common; no sporangia seen. 



4. S. xovae-hollandiae Sender, 1845, p. 50; Sauvageau,- 1901, 

 p. 137, fig. 33. In small quantity, among S. trihvloides, Spanish Rock, 



9 In references to this work, the page given is that of the completed and 

 separate issue; the date, however, is that of the original publication in the 

 Journal de Botanique. 



