510 Howe: PHYCOLOGICAL STUDIES 
Fusco-nigrescent or sometimes sordid- or tawny-green when 
living, of a similar color on drying, gregarious or scattered, with 
or without a horizontal rhizome : stipe flattened or subterete, I-15 
cm. long, 3-10 mm. wide, rarely deficient, simple or forking near 
the base: flabellum cuneate-obovate, oblong, or sometimes sub- 
orbicular, now and then diffuse, imperfectly complanate, and 
irregularly lobed, 1-12 cm. broad, coriaceous in the smaller 
forms, thinner and of looser texture in the larger, most obscurely 
or not at all zonate, the surface strigose, subvelutinous, or minutely 
spongiose : filaments of flabellum cylindrical, strongly constricted 
just above the dichotomy, rarely here and there subtorulose, 
usually firm-walled and mostly rather straight and rigid, 28-70 
in diameter ; filaments of surface of stipe commonly more slender, 
interwoven, rhizoid-like, those of interior sometimes crowded with 
amylum grains, 
Type Locatity: “Ad Antillas” [Antigua] ; type specimen 
in the Sonder collection of the National Herbarium of Victoria, 
Australia. 
DistriBuTION : Bermuda and the West Indies. 
The maintenance of the binomial Avrainvillea longicaulis for 
the present species and the crediting of the name to Murray & 
Boodle are both, we believe, technically correct, even though it 
may prove a source of some confusion for a time, inasmuch as — 
Murray & Boodle evidently intended that another species — the 
true A. nigricans Decaisne — should bear Kiitzing’s name /ongt- 
caulis, But, as Murray & Boodle in proposing the new combi- 
nation Avrainvillea lungicaulis cited Kitzing’s Rhipilia longicaults, 
it cannot be denied that this new combination applies also to 
Kitzing’s species and that it applies to it in a peculiar and typical 
way. Notes by the present writer on Kiitzing’s type-specimen 
have been published in the place cited above and in the same 
paper also (pages 567, 568) are comments on the relationship of 
the present species to A, nigricans. A. longicaulis and A. nigricans 
often grow intermingled and resembling each other so closely that 
they cannot be determined without a microscopical examination, 
yet the more that we see of them the more we are inclined to the 
belief that they represent true species. 
3. Avrainvillea Rawsoni (Dickie) 
Rhipilia Rawsoni Dickie, Jour. Linn. Soc. 14: 54: A. Te, ft, 
2. 1874. 
