93 
Gen. Heterosiphonia, Mont. 
H. plumosa, Batt. Common. 
Fig.: Harvey II, 130 [as Dasya coccinea. 
Wisemict : In all! districts. 
Zone: L.W.O.N.1. and below. 
Occurrence: Perennial. 
Reproduction :' Cystocarpia in Summer ani Autumn; _ tetraspores 
in Autumn. 
‘Notes: Basal parts only to be found in Winter ; young shoots appear 
in March. 
Fam. CERAMIACEAE. 
Gen. Spondylothamnion, Nag. 
S.multifidum, Nag. Rare. 
Fig.: Harvey III, 247 [as Wvangelia multifida|]. Plate XVII, 63. 
Wistnicte=em bore Erm 5 Peel; Kirk Onchan (Brady); ‘Port Jack 
(Talbot). 
Zones Below L.W-O.Si1. 
Occurrence: Annual, Summer. 
Reproduction: Tetraspores in August. 
Gen. Spermothamnion, Aresch. 
S. Luymeri, Aresch. Frequent. 
Fig.: Harvey III, 252 [as Callthamnion Turneri]. 
District : In all districts. 
Zones vi .-zone to L.W-O.N.T. 
Occurrence: Pseudo-perennial. 
Reproduction: In Winter. 
Notes: Can be found persistently in certain definite localities. 
S. barbatum, Born, var. mesocarpum, Batt. 
Fig.: Harvey III, 276 ‘as Callithamnion mesocarpum). 
: Wistuices) Port. Erin. 
| Notes: Recorded by R. J. Harvey-Gibson. No data available. 
Gen. Trailliella, Batt. 
T. intricata, Batt. Occasional. 
Fig.: Rosenvinge (1909), pt. III, p: 306. Plate XIV, 43, 44. 
District: Port Erin; Port St. Mary ; Castletown ; Pooyllvaaish. 
Zone: M.T. zone to L.W-.O.N.T. 
Occurrence: Appears to be an annual. 
Reproduction: No data. 
Notes: Epiphyte on pool algae, chiefly Corallina officinalis. 
Gen. Ptilothamnion, Thuret. 
P. pluma, Thur. 
Fig.: Harvey III, 254 [as Callithamnion pluma}. 
Wistuct = Port Exin: 
Note: Single record: epiphytic on Laminaria stipe. 
