98 
Gen. Antithamnion, Nag. 
A. cruciatum, Nag. Kare. 
Fig.: Harvey, ITI, 250 [as Callithamnion cruciatum]. Plate XVII, 66. 
District: Port Erin. Fleshwick Bay. 
Zone: L.W.O.N.T. and into sub-littoral zone. 
Reproduction : Tetraspores in August. 
Notes: Cast ashore on Zostera in November. Material all sterile. 
A. plumula, Thur. Rare. 
Fig.: Harvey III, 249 [as Callithamnion plumula]. 
District: Douglas Bay. Fleshwick Bay. 
Zone: Sub-littoral. 
Occurrence: Found in August and September. 
Reproduction : Tetraspores in August, cystocarpia in September. 
Notes: Dredged from deep water. 
Gen. Ceramium, Lyngb. 
C. gracillimum, Harv. Rare. 
is): Harvey fil 23i- 
District: Port Erin; Port St. Mary; Castletown. 
Zone: Below L.W.O.S.T. 
Occurrence: Annual, Summer. 
Reproduction: No data. 
Notes: Generally epiphytic on the larger algae. 
C. tenuissimum, J. Ag. Not common. 
Fig.: Harvey III, 233 [as Cervamium nodosum). 
District: Port Erin; Port St. Mary; Pooyllvaaish; Douglas Bay 
(Talbot). 
Zone: L.W.O.N-1. to L-W.O.S.1, in pools: 
Occurrence: Annual, Summer. 
C. strictum, Harv. Not uncommon. 
Bis. > Harvey, fil) 232° 
District: Port 21in); ~Port.St. Many: 
Zone: L.W.O.N.T. in pools. 
Occurrence: Annual, Spring and early Summer. 
Reproduction: Tetraspores in Spring. 
C. fastigiatum, Harv. 
Big. Harvey Ill, 234. 
District: Douglas Bay. 
Notes: Recorded by Talbot; no data available. 
C. diaphanum, Roth. Not common. 
fig.: Harvey iil 230. 
District: Port St. Mary; Douglas Bay (Brady, Talbot). 
Zone: M.T. zone and below in pools. 
Occurrence: Annual, Summer. 
Reproduction : Cystocarpia in Summer. 
