27 



We have seen no specimen of Fradelia fuliginosa, but in view of Chauvin's excellent 

 description and remarks (loc. cit.) we recognise the strong likeness of the plant to . /. nigri- 

 cans which was published by Decaisne a few months previously (see p. 17); but of course 

 without examining the type we cannot be certain of the identity of the plant, since Chauvin 

 omitted to state the size of the filaments ; and it must not be forgotten that Fradel's plant 

 was collected at Pernambuco more than 2000 miles away from Grenada, the nearest recorded 

 station of A. nigricans. 



A. nigricans is recorded only from the warm Atlantic. 



3. Avrainvillca Mazei Murray and Boodle 



in Journal of Botany XXVII. 1889 pp. 70, 71, tab. 288, fig. 6. 

 Syn. Flabellaria fimbriata Mazé et Schramm Algues de la Guadeloupe. 2">e edit. 1870 — jy. p. 89; 



and Errata p. II. 

 Avrainvillca sordida var. longipes Crouan ex Mazé et Schramm Algues de la Guadeloupe. 



2'»c e dit. 1870 — y/. p. 90 (pro parte). 

 Uclotca Dcsfontainii J. G. Agardh Till Alg. Syst. V. 1887. p. 74 (pro parte). 

 Avrainvillca Mazei Murray in Journ. of Bot. XXVII. 1S89. p. 238. 

 Avrainvillca Mazei De Toni Syll. Alg. I. 1889. p. 514. 

 Avrainvillca longicaulis Howe in Buil. Torrey Bot. Club. XXXIV. 1907. p. 509 (excluding 



synon. Rhipilia longicaulis Kütz.). 

 Avrainvillca Mazei Börgesen in Vid. Medd. nat. Foren. Kjöbnhavn. 1908. p. 32. 

 Avrainvillea longicaulis Collins Green Algae N. Amer. in Tufts College Studies II. 1909. p. 391. 



Hab. ATLANTIC. Guadeloupe, Moule (Vieux bourg) port; dans Ie sable sur des bancs de Xostera, 

 lieux abrités par les brisants du large; en Juin 62; leg. Schramm: Mazé n° 65, [ère sér. 

 (sub nom. " Flabellaria fimbriata")\ — Guadeloupe, Marie Galante (Grand Bourg) plage des 

 Basses, 21 févricr 1870, Mazé n° 1234 (sub nom. "Avrainvillca sordida var. longipes n )\ - 

 Bahamas, Catesby in Herb. Sloane vol. 232, fol. 18 ! (see p. 16) — Bahamas, Waterloo Lake near 

 Nassau, April 9. 1904, in mangrove mud, near low water mark. Howe n" 3073 (in Herb. 

 Kew) ! — Bahamas, Mariguana, Howe, in Phyc. Bor. Amer. n" 1479! - Bermuda, Gibbet 

 Island, on rocks and sand in 3 dm. of water (low tide). Hoive n° 35 (this specimen contains 

 intrusive torulose filaments of another species A. nigricans) l 



Plant (dried) brown, about 13 cm. high, gregarious or solitary, arising from a bulbous 

 base. Stipes simple, straight, compressed, 5 — 6 cm. long, 5 — 10 mm. widc. Frond from a 

 short cuneato-rotundate base, obovate, rotundate or spathulate, about 6 cm. long, 5 cm. wide, 

 of medium thickness, ezonate, rather smooth to strigose. Frond filaments cylindrical, rarely 

 faintly sub-torulose, large, 40 — 60 p. in diam., light to dark-brown in colour, branches markedly 

 constricted just above the dichotomy, not tapering at apices. [Figs. 81 — -83]. 



The above description is drawn from the type specimens of Murray and Boodle, pre- 

 served in the British Museum, viz. Mazé's n" 65 (i ère sér.) from Guadeloupe (fig. 81). The 

 characteristic feature of this species is the large cylindrical brown filaments much constricted 

 just above their points of dichotomy, of fairly uniform diameter, not tapering towards their 

 apices (figs. 82, 83). 



Dr. Howe (loc. cit.) has combined this species with Rhipilia longicaulis Kütz. and placed 

 them both under the designation " Avrainvillea longicaulis (Kütz.) Murray and Boodle p.p.", 



