bi 
71 
Gen. Leathesia, S. F. Gray. 
L. difformis, Areseh. 
Fig.: Harvey I, 56 [as L. tuberifornis, S. F. Gray]. 
District : In all districts. 
Zone: In all zones. 
Occurrence: Annual, Summer. 
Reproduction : Unilocular sporangia produced all through the Summer ; 
plurilocular sporangia developed at the end of August. 
Notes: Found growing on rock surfaces or epiphytically on other 
algae. Appears in March or April, grows rapidly, reaching 
its maximum size in July. Plants begin to degenerate 
early in September. 
Fam. SPOROCHNACEAE. 
Gen. Sporochnus, Ag. 
S. pedunculatus, Ag. Not common. 
Fig.: Harvey I, 21. 
District : hog ; Douglas Bay (Mrs. Gatty); Fleshwick Bay; Bay 
ine. 
Occurrence: Annual, Summer. 
Reproduction : Unilocular sporangia in August and September. 
Notes: Dredged from deep water or occasionally cast up. 
Fam. CHORDACEAE. 
Gen. Chorda, Stackh. 
C. filum, Stackh. Common. 
Fig.: Harvey I, 30. 
District: Port Erin; Port St. Mary; Douglas Bay (Talbot); Peel. 
Zone: L.W.O.N.T. and below. 
Occurrence: Pseudo-perennial. 
Reproduction: Unilocular sporangia in Spring and Summer. 
Notes: Forms colonies in sheltered places at low tide zone or in deep 
low lying pools. Can be found as scattered plants at all 
times of the year, but most plentiful in Summer. 
C. tomentosa, Lyngb. 
District : * Port Erin. 
Note: Recorded by R. J. Harvey-Gibson. No data available. 
Fam. LAMINARIACEAE. 
Gen. Laminaria, Lamour. 
L. saccharina, Lamour. Common. 
Bigs: Harvey I, 27. 
District : In all districts. 
Zone: L.W.O.N.T. 
Occurrence: Perennial. 
Reproduction: General. 
