136 I 0LLIN8 \ND BSRVE1 . 



I u.i.i I II IMNION I.\ ogb; 



l. Branching distichous, pinnate. 

 1. Branching radial «>r dichotomous. 

 2. Little cortication, cells l<>im. ultimate ramuli lonn, Blender. 



1. C. roeeum. 



J Much cortication, oella short, pinnae decompound, ultimate ramuli, 



short, stout. ."). C. II<x.ki'ri. 



Branching alternate throughout. 1. (\ byssoideum. 



.">. Branching at least in p:trt dichotomous. 1. 



L. [Jltimate divisions long, slender. •'>. C. cordatum. 



\. [Jltimate divisions shorter and stouter. 5. 



."). Alternate branching usually confined to axis and branches <>f first order, 



otherwise dichotomous. C Balliae. 



5. Only smaller divisions dichotomous: distance very short between forking. 



2. C. oorymbosum. 



1. ('. BYSSOIDEUM Arnott var. JAMAICENSE Collins, 1001, p. 258; 



P. B.-A., No. 2045. Gravelly Bay, Jan.. Feb., March, Oct., Hervey; 

 April, Aug., Collins. Growing in dense patches, not over 3 cm. high, 

 just below low water mark, in a small cave. In the water it shows 

 a peculiar bluish iridescence, like the bloom on a plum. 



2. C. corymbosum (Eng. Bot.) Lyngbye, 1819, p. 125, PI. 

 XXXVIII. ('.; Harvey, 1846-51, PL CCLXXII; Conferva corymbosa 



Bot., 1811, I'l- MMCCCLII. Washed ashore, Cooper's Island, 

 Feb., FaHnw; on WrightieUa Blodgettii, Harris Bay, April, Collins. 

 In hoth cases with abundant tetraspores. 



o\ C. Halliae Collins in P. B.-A., No. 698; 1906, p. Ill; P. B.-A., 

 NO. L896. Outlet of Harrington Sound, Jan., Feb., March., Hervey, 

 • and handsome plants; tetraspores in Jan., no other fruit; 

 Burchell's Cove, Feb., large rich purple patches on bottom in shallow- 

 water, Hervey; shore of Agar's Island, Dec, Collin-. 



4. C. ROSEUii (Roth) Harvey in Hooker, 1833, p. 341; Harvey, 

 1846-51, PI. CCXXX; Ceramium roseum Roth, L798, p. 46. Od 

 Codium, Dear Causeway, Feb., Hervey, with tetraspores. The plants 

 are attached to the ('odium by a dense mass of slender filaments with 

 red protoplasts, penetrating deeply the tissue of the host They are 

 continuation-, of the descending growths from the bases of the branches, 

 which COVer the lower part of the axis, as a cortex. 



5. C. Hookeei Dillw.) Agardh, L828, p. 178; Harvey. L846 51, 

 PI. CCLXXIX; P.B.-A., No. 2046; Conferva Hookeri Dillwyn, 

 L809, I'l. C\'I. Kemp, as 0. spongiosum. Pink Beach, -fan.. Feb., 



