1911] Emerton,— New England Federation 187 
Chantransia Dufourii n. sp. Filamento de cellula basali singula 
sphaerica, 5-8 u diam., egrediente, 4-5 u diam., cellulis 2-5 diam. 
longis; ramificatione interdum opposita vel alternante, at plerumque 
secunda; ramis erectis, subdistantibus; sporis 5-6 x 7-10 u, sessi- 
libus vel pedicello unicellulari affixis, ad filamentum principale vel 
ramum, plerumque secundatim seriatis. 
Filament arising from a single spherical basal cell, 5-8 u diam.; 
erect, 4-5 u diam., cells 2-5 diam. long; branching sometimes opposite 
or alternate, more commonly secund; branches erect, not very closely 
set; spores 5-6 x 7-10 y, sessile or on a one-celled pedicel, on the main 
filament or on a branch, usually in secund series. On Sargassum 
vulgare Ag., Beaufort, North Carolina, collected by Dr. W. D. Hoyt. 
Type specimens in the National Herbarium at Washington; cotype 
material distributed as P. B.-A., No. 1594, under the name of Acro- 
chaetium  Dufourii. | 
This minute species is common on fronds of Sargassum, usually in 
company with Erythrotrichia ceramicola (Lyng.) Aresch., and often 
with Gontotrichum elegans (Chauv.) Le Jolis. It appears to be the 
plant of the Mediterranean distributed by Dufour in Erb. Crit. Ital., 
No. 953, as Callithamnion Lenormandi, but not C. Lenormandi Suhr 
in Kützing, Sp. Alg., p. 640. 
AHNFELDTIA PLICATA (Huds.) Fries, forma furcellata nov. forma. 
Ramificatione regulariter dichotoma, frondem subflabellatam effi- 
ciente. 
Branching regularly dichotomous, giving a flabellate outline to 
the frond. Black Rock, New Bedford Harbor, Massachusetts, 
July 25, 1909, Prof. G. T. Moore. Type in herb. F. S. C.; cotype 
material distributed as P. B.-A., No. 1645. 
In the typical form of Ahnfeldtia plicata, the branching is very 
irregular, the branches of quite unequal length, so that the tufts have 
a very ragged appearance; in the present form the branching is as 
regular as that of Polyides rotundus (Gmel.) Grev., which it consider- 
ably resembles, although the Polyides is usually a considerably 
stouter plant. 
MALDEN, MASSACHUSETTS. 
New ENGLAND FEDERATION oF NATURAL History SOCIETIES. — 
The autumn meeting of the Federation will be held at Lawrence, 
Massachusetts, Friday and Saturday, September 29 and 30 in con- 
nection with the Natural History Societies of Lawrence and Andover. 
