50 
Reproduction: Zoospores and gametes together in Autumn but 
zoospores precede gametes in Spring. 
Notes: Always occurs higher up the shore than U. bangioides and 
attains maximum growth during Winter and Spring months. 
U. bangioides, Holm and Batt. Locally frequent. 
Fig.: Plate XVI, 46. 
District: Port Erin. 
Zone: L.W.O.N.T. to L.W.O.S.T. 
Occurrence: Pseudo-perennial. 
Reproduction: Asexual reproduction by zoospores in Winter, sexual 
reproduction in Spring. 
Notes: Only been found at low water covering large stretches of 
rock ; is not able to stand long exposures to the air. 
U. collabens, Holm and Batt. Rare. 
rigess lave Seve aa. 
District : Port St. Mary. 
Zone: H.W.O.N.T. 
Occurrence: No data. 
Reproduction: No data. 
Notes: Found mixed with Uvospora isogona. 
Gen. Chaetomorpha, Kiitz. 
Occurring separately or together as components of flora in top pools. 
Frequently in pools that are inhabited exclusively by Chlorophyceae, 
that is, pools in which the hydrogen ion concentration rises high during 
Summer. 
C. tortuosa, Kitz. Frequent. . 
Fig.: Harvey IV, 321 [as Conferva tortuosa]. 
District: Port Erin; Port St. Mary; Castletown; Pooyllvaaish ; 
Douglas Bay. 
Zone: H.W.O.N.T. 
Occurrence: Pseudo-perennial. 
Reproduction: No data. 
Notes: Forms tangled skeins loosely tangled round other algae, e.g., 
Corallina. May become conspicuous in early summer at 
Port St. Mary. 
C. litorea, Cook. Not common. 
Fig.: Harvey IV, 318 [as Conferva litorea]. 
District: Port Erin; Douglas Bay (Talbot). 
Zone: L.W.O.N.T. 
Occurrence: No data. Single record for February. 
Reproduction: No data. 
Notes: Few threads only have been found. These were entangled 
in Sphacelaria civrhosa. Cotton regards this species as 
a slender form of Chaetomorpha linum. Since our specimen — 
had the occasional swollen cells characteristic of C. hiovea | 
as illustrated in Harvey, we have retained it under this 
name. % 
