2 9 



("6o : i") be wrong, the filaments described and figured would lack the character of the 

 cylindrical, non-tapering, coloured, obtuse filaments of typical A. Mazei. 



As stated above, the filaments depicted by Kützing resemble both in dimensions and in 

 character those of A. sordida; and, on the supposition that Kützing's rendering and magnification 

 are accurate, we consider Rhipilia longicaulis Kütz. to be synonymous with A. sordida (p. 40). 



Finally, if Kützing's plant be really A. sordida the puzzle of the so-called hairs ("apice 

 in pilum subtile tenerrimum hyalinum attenuata" Kütz.) is of course explained, since the apical 

 filaments in the frond of A. sordida are among the most slender in 'the genus. 



Dr. Börgesen (loc. cit.) has described and figured an A. Mazei forma, which we have 

 not seen, but which appears to be an intermediate. It approaches A. Mazei in its thicker 

 cylindric inner filaments, and A. sordida in its thinner subtorulose surface filaments. 



A. Mazei is record ed only from the West Inches. 



4. Avrainvillea crccta comb. nov. 



Syn. Dichonenta eredam Berkeley in Hooker's London Journal of Botany I. 1842 p. 157, tab. VII, 



fig. 1 1 (structura false depicta). 

 Udotea sordida Mont. in Hooker's London Journal of Botany. III. 1844 p. 659; Syll. Gen. 



Spec. Crypt. Paris 1S56, p. 451. 

 Chloroplegma papuanum Zanard. in Nuov. Giorn. Bot. Ital. X. 1878. p. 37. 

 Chlorodesmis pachypus Kjellm. in Wittr. et Nordst. Algae Exsicc. n° 343 (1879); in Botan. 



Notiser, 15 Sept. 1880. p. 117. 

 Rhipilia Andersonii Murray in Trans. Linn. Soc. Bot. scr. II vol. II. 1886 p. 225, tab. 31 



(optime depicta). 

 Rhipidonema erectum Saccardo Syll. Fungorum VI. (1888). p. 689. 



Avrainvillea papuana Murray et Boodle in Journ. of Botany XX VII. 1889 p. 71, tab. 289. 

 Avrainvillea papuana De Toni Syll. Alg. I. 18S9. p. 514. 

 Aurainvillea papuana Heydrich in Ber. deutsch. bot. Gesellsch. XXV. 1907 p. 10 1. 



Hab. INDIC. Sorong, New Guinea, Beccari\ — Labuan, Borneo, Kjellman in Wittr. & Nordstedt 

 Algae Exsicc. n" 343! — Philippines, Cu/uiiig, n° 2234 Herb. Mus. Brit! & Herb. Kew ! 

 n° 2233 Herb. Delessert. — King's Island Bay, Mergui Archipelago, Andersonl — Ceylon, 

 Ferguson, n" s 290 ! 313! — Pearl Bank, Ceylon, Herdman ! — Madras, Thurston ! with fruit. 



Siboga Expedition. Stat. 37. Paternoster Islands, 20 m. ! — Stat. 71. Makassar, 15 m.! 

 Stat. 163. Selee-Strait, New Guinea, reef! — Stat. 231. Ambon, reef! — Stat. 261. Great- 

 Kei Island, reef! — Stat. 285. South coast of Timor, 34 m.! — Stat. 296. Noimini Bay, 

 South coast of Timor, reef! — Stat. 299. Buka Bay, Rotti, reef! — Stat. 301. Pepela Bay, 

 Rotti, reef! — Stat. 313. Saleh Bay, Sumbawa, 15 — 36 m.! — Stat. 323. Sangkapura-roads, 

 Bawean Island, reef! 



Pacific. Riukiu, Kuroiwa, fide Heydrich. 



Plant solitary, consisting of a dense stout, cylindrical elongated mass of rootlets, often 

 10 cm. long, bearing a shortly stipitate or subsessile frond; frond brown, usually small, 3.5 — 5 cm. 

 wide, sometimes larger (up to 10 cm. wide) reniform to subcuneate-securiform or subrotundate, 

 thin or thick, sometimes obscurely zonate, margin entire or sometimes fibrilloso-fimbriate. 

 Filaments of frond large (30 — 60 u.) cylindrical, not tapering, never torulose, yellow, often 

 intensely fulvous at their apices. Sporangia terminal on filaments shortly exserted all over the 

 surface of the frond. Spores not seen. [Figs. 84 — 89]. 



