Howe: PHYCOLOGICAL STUDIES 509 
Avrainvillea longicaulis Murr. & Boodle, p. ~. Jour. Bot. 27: 70. 
pl. 228. f. 1-5. 1889. (Excluding syn. Rhipiha longicaulis 
Kiitz.) 
Usually fusco-nigrescent when living or rarely tawny-green, of 
a similar color on drying or somewhat darker or more sordid, gre- 
garious or scattered, normally with a stout horizontal rhizome 
(commonly left in substratum as ordinarily collected), or, when 
small and poorly developed, with a somewhat bulbous or difform 
base : stipe cylindrical or flattened, 1-16 cm. long, 3-14 mm. wide, 
now and then deficient or scarcely differentiated, simple or rarely 
forked near the base: flabellum varying from suborbicular (reni- 
form-cordate when young) to cuneiform (sometimes subclavate 
when young), I~25 cm. broad, entire or more or less lacerately or 
digitately lobed, thin and membranous in the broader forms, 
thicker and more coriaceous in the narrower, felt-like in texture, 
very obscurely or not at all zonate, the surface subvelutinous or 
minutely spongiose : filaments of flabellum distinctly moniliform 
or torulose (at least those near the surface) usually firm-walled 
and rather straight and rigid, 33-70 # in maximum diameter, fila- 
ments of stipe similar, but with more differentiation between those 
of surface and those of interior: sporangia mostly subpyriform, 
varying from clavate to subglobose, 0.35-0.83 mm. X 0.20—-0.35 
mm., usually exserted once or twice their own length; spores 
ovoid, pyriform, or elongate-ellipsoidal, 130-3004 x 66-120 #. 
Type Locatity: Iles des Saintes, near Guadeloupe, West 
Indies ; type specimen in the herbarium of the Muséum d’ Histoire 
Naturelle in Paris. 
Distrisution: Bermuda, southern Florida, the West Indies, 
and South America. 
Avrainvillea nigricans, as here conceived, is widely variable in 
form and size, though tolerably uniform in the character of its fila- 
ments. Further remarks by the writer on its range of variation 
may be found in the place cited above. 
2. AVRAINVILLEA LONGICAULIS (Kiitz.) Murr. & Boodle, 7.?. Jour. 
Bot. 27: 70. 1889. (Excluding all but syn. Rhipilia longi- 
caulis Kiitz., which may be fairly considered the “type”’ of 
the new binomial.) 
Khipilia longicaulis Kitz.* Tab. Phyc. 8: 13. pl. 28 fi I. 
1858. 
Avrainvillea Mazei Murr. & Boodle, /. c. pl. 288. f. 6. 
ST sae eats ay ghee aki | eae 
*M. A. Howe, Bull. Torrey Club 32: 586. 1905. 
