56 
D. aculeata, Lamour. Common. 
Fig.: Harvey I, 18. 
District : In all districts. 
Zone: Below L.W.O.S.T. 
Occurrence: Perennial. 
Reproduction: No data. 
Notes: This species only obtained by dredging. Abundant September 
to November. Winter form maintained until March. 
D. ligulata, Lamour. Kare. 
Rigi: Hanvey 17 17. 
District: Port Erin; Port St. Mary; Castletown; Peel. 
Zone: L.W.O.N.T. and below. 
Occurrence: Annual, Spring and Summer. 
Reproduction: No data. 
Notes: Appears to be a deep water form, but young plants, 2 ins. 
long, were found at L.W.O.N.T. mark in February on the 
Port St. Mary ledges. Old plants frequently cast up in 
the Summer. 
Fam. DICTYOSIPHONACEAE. 
Gen. Dictyosiphon, Grev. 
D. foeniculaceus, Grev. Common. 
Fig.: Harvey I, 41. 
District: In all districts. 
Zone: H.W.O.N.T. to M.T. zone. 
Occurrence: Annual, Summer. 
Reproduction : Unilocular sporangia, Summer. 
Notes: Very common on gently sloping shores such as Castletown, 
nearly filling the pools at mid-tide zone. In July forms 
a conspicuous band round the foot of the rocks on the 
northern end of Port Erin beach. In September and 
October nearly always epiphytic on Chordaria flagelliformis. 
Fam. PUNCTARIACEAE. 
Gen. Mikrosyphar, Kuck. 
M. Polysiphoniae, Kuck. (See Note 2 Ps LOS.) 
Fig.: Oltmanns III, p. 463. 
District: Port St. Mary. 
Zone: Same as host. 
Occurrence: Sporadic. 
Reproduction: Plurilocular sporangia in February. 
Notes: Endophytic in walls of Polysiphonia urceolata ; has also been 
observed in Cevamium Deslongschampsii and Callithamnion 
arbuscula. 
