854 DR. SARAH M. BAKER AND MISS M. H. BOHLING ON 
Hab. Sublittoral, in still water, on the sea-bottom at from 8-10 m. depth. 
Rágón, Trollholmen, and Småland, Baltic Sea. 
Fucus vesiculosus Ё, nana, C. A. Ag. Syn. Alg. p. 5; №. Svedelius, Stud. 
ОЕ Östersjöns Наа. 1901, р. 84; Arcichovski] 1 1905), pls. 1, 8, 4. 
Fucus vesiculosus Ё. degenerativus, Arc. Arcichovskij (1905), pl. 1. 9-11 ; 
pl. 3. 15-19, 27-29; pl. 4. 25. 
(e) Bead subecostatus (Ag.). 
Thallus variable in size, leading from dwarf forms 2-3 ems. in length to the 
attached form v. angustifolia, Kiellm. Cryptostomata prominent, in dwarf 
forms marginal, in larger forms arranged in two rows on either side of the 
midrib, Always sterile. 
Hab. Sublittoral, in still water, on the sea-bottom from 8-10 m. depth. 
Durgsvik, Roneham, and Slite, in Gothland : Baltic Sea. 
Fucus vesiculosus f. subecostata, C. А. Ag. Syn. Alg. 5; №. Svedelius, 
Stud. öf Ost. Hafsalg. 1901, p.84. a &B, Areichoveli kij i 905), pls. 1& 2 
(f) Bead filiformis (Ag.). 
Thallus very variable in size, leading from filiform plants 15 ems. high 
to the attached form у. angustifolia, Kjellm. Cryptostomata absent. Always 
sterile. 
Hab. Sublittoral, in still water on the sea-bottom from lower littoral 
region to 5 m. depth.  Lergloviken, Källvik, and Gudingefjärden, in 
Småland ; Baltic Sea. 
Fucus vesiculosus f. filiformis, Ag, in Svensk Bot. tab. 516. fig. ¢ (mis- 
printed d); N. Svedelius, Stud. öf Öst. Hafsalg. 1901, р. 84. а д, 
Arcichovskij (1905), pls. 1-8. 
Fucus vesiculosus f. polytomus, Arc. Arcichovskij (1905), pl. 1. 5-8; 
pl. 3. 12-13 ; pl. 4. 26-27. 
Fucus CERANOIDES, L. 
Frond 2-3 dm. long, 0:5-2 ems. broad, plane, eoriaceo-membranaceous, 
very delicate, linear, subdichotomous, entire at the margin, midribbed, without 
vesicles, but often showing extensive blister-like swellings. Lateral branches 
narrower than the frond, repeatedly forked, level topped, bearing fruit in 
their apices. Receptacles spindle-shaped or bifid, acute.  Diwcious or 
hermaphrodite. 
Megecad LIMICOLA. 
Plant unattached, but lower parts embedded. Reproduction hy 
vegetative budding. Length 5-10 ems., breadth 0:5-1 em. Frond 
delicate, much curled. Cryptostomata very prominent, but not marginal, 
Receptacles rare. Hermaphrodite and moneeious on the same 
individual. Oogonia undivided. 
Hab. Upper levels of brackish marshes. Keyhaven, Hants: Laira Lake, 
Plymouth. 
