ih) 
Sub-Order. TILOPTERIDEAE. 
Gen. Tilopteris, Kiitz. 
T. Mertensii, Kiitz. Very rare. 
Fig.: Oltmanns II, p. 174. 
District: Pooyllvaaish. 
Zone: M.T. zone. 
Occurrence: Annual, Spring. 
Reproduction: Monosporangia and plurilocular sporangia in April. 
One record only. April, 1931. 
Gen. Achinetospora, Born. 
A. pusilla, Born, var. crinita, Batt. 
Fig.: Oltmanns II, p. 173. 
District: Port Erin; Port St. Mary. 
Notes: No data available. Recorded by R. J. Harvey-Gibson. 
Sub-Order. DICTYOTEAE. 
Fam. DICTYOTACEAE. 
Gen. Dictyota, Lamour. 
D. dichotoma, Lamour. Frequent. 
Fig.: Harvey I, 38. 
District: In all districts. 
Zone: M.T. zone and below. 
Occurrence: Pseudo-perennial. 
Reproduction: Tetrasporic plants prevalent in Autumn; sexual plants 
in Spring and early Summer. Both types may, however, 
occur simultaneously. 
Notes: Basal parts recognisable in Winter. 
D. dichotoma, var. implexa, J. Ag. Not common. 
Fig.: Harvey I, 38 fas D. dichotoma var. intricata]. 
District: Port Erin. 
Zone: Cast ashore (probably from deep water). 
Reproduction: Tetrasporic plants in Autumn. 
Notes: Numerous plants cast ashore in October. 
D. ligulata, Kitz. 
Notes: Recorded by R. J. Harvey-Gibson for Port Erin and Port 
St. Mary. No other data available. 
Gen. Dictyopteris, Lamour. 
D. membranacea, Batt. Rare. 
Fig.: Harvey I, 33 [as Haliseris polypodioides]. 
District: Port Erin; Douglas Bay (Talbot). 
Zone: Dredged in deep water. 
Reproduction: Tetrasporic plants in Winter. 
