96 
C. Dudresnayi, Crn. Rare. 
Fig.: Harvey III, 267 [as Callithamnion- affine]. Plate XVI, 60. 
Plate XVII, 65. 
District: Port St. Mary. 
Zone: L.W.O.N.T. in pools. 
Occurrence: Annual, Spring. 
Reproduction: Tetraspores in March and Apri. 
C. Hookeri, Ag. Common. (See Note 18, p. 116.) 
Fig.: Harvey III, 260. 
District: In all districts. 
Zone: M.T. zone downwards. 
Occurrence: Pseudo-perennial. 
Reproduction: Tetraspores, cystocarpia and spermatia in Winter 
and Spring. 
Notes: Plant begins activity in January; usually epiphytic on other 
algae in pools. 
C. Brodiaei, Harv. 
Fig.: Harvey IIT, 256. 
Notes: Recorded by Marrat for Isle of Man. No data for locality 
available. 
C. arbuscula, Lyngb. Common. 
Fig : Harvey iil, 255. Plate XVIE, 6s: 
District: In all districts. 
Zone: M.T. zone downwards. 
Occurrence: Perennial. 
Reproduction: Tetraspores in Autumn: cystocarpia and spermatia 
in Winter. 
Notes: Nearly always found growing epiphytically, generally on 
Corallina. 
C. tetragonum, Ag. Not uncommon. 
us. 7° Plarvey. 1il, 257: 
District: Port Erin; Port St. Mary; Castletown; Douglas Bay 
(Brady, Talbot); Peel. 
Lone: > 1.W-O-N-T] toc EW. OLS: 
Occurrence: Pseudo-perennial. 
Reproduction: Cystocarpia, spermatia and tetraspores in Winter and 
Spring; the sexual and asexual organs often found 
on the same plant. 
Notes: Generally epiphytic on other algae in low lying pools. 
C. brachiatum, Bonnem. Frequent. 
Fig : Harvey III, 258. Mathias, 1928. Plate XVIII, 74. 
District: Port Erin; Port St. Mary; Castletown; Douglas Bay 
(Talbot); Pest 
Zone: M.T. zone downwards. 
Occurrence: Pseudo-perennial. 
Reproduction: Cystocarpia, spermatia and tetraspores in Autumn 
and Winter. ; 
Notes: Found seowate epiphytically on other algae in well-illuminated 
pools. . 
