46 
Gen. Monostroma, Thur. 
a@ EUMONOSTROMA 
M. Wittrocki, Born. 
Fig.: Hauck, Meeresalgen, p. 423. 
District: Port Erin; Port St. Mary; Pooyllvaaish. 
Zone: M.T. zone in pools. 
Occurrence: Annual, Spring and Summer. 
Reproduction: Spring and Summer. 
b ULVARIA 
M. Grevillei, Wittr. Common. 
Fig.: Harvey IV, 341 (as Ulva lactuca Linn.] 
District : Common in all districts. 
Zone: M.T. pools to H.W.O.N.T. 
Occurrence: Annual, Spring and Summer. 
Reproduction: Most marked in August. 
M. Grevillet, Wittr., var. Cornucopiae, Batt. Uncommon. 
Fig.: Harvey IV, 330 [as Enteromorpha cornucopiae] 
District: Port Exim > Port St; Many: 
Zone: M.T. pools. 
Occurrence: Spring and Summer. 
Reproduction: Spring and Summer. 
Notes: Generally epiphytic on Covallina officinalis. This appears 
to be the young stage of AZonostroma Grevillet. 
Gen. Capsosiphon, Gobi. 
C. aureolus, Gobi. 
Fig.: Hauck, Meeresalgen, p. 434 [as Enteromorpha aureola (Ag.) 
Kitz. | 
District: Port Erin; Chasms. 
Zone? EW .O:S. ©: 
Occurrence: Casual. 
Reproduction : Frequent. 
Notes: Mixed with Prasiola stipitata and Entervomorpha micrococca 
on the concrete at the end of Port Erin Promenade, just 
above the broken breakwater. 
Gen. Percursaria, Bory. 
P. percursa, Rosenv. Uncommon. 
Fig.: Plate XV, 55, 56. 
District: Port Erin ; Port St: Mary > Peek 
Zone: M.T. to H.W.O.N.T. 
Occurrence: Pseudo-perennial. 
Reproduction: At all times of year. 
Notes: Found occasionally in quiet pools on the shore in the summer, 
but frequent in lobster tanks at Biological Station during 
winter. 
