184 Rhodora [AUGUST 
NOTES ON ALGAE, — X. 
FRANK S. COLLINS. 
A FEW additions to the North American Flora are recorded in this 
note, of the blue-green and the red algae; the recent additions to 
the green algae are not here given. In 1909 the writer published 
a paper! intended to bring together what was known of this group 
of algae. As usual in such cases, this paper stimulated the study 
of the group, and in the two years since its publication many addi- 
tional facts have been received, either as to additional species, or giv- 
ing fuller information as to species there noted. "These additions 
it Is proposed to publish in the course of the year in the Tufts College 
Studies. 
Dermocarpa Vickersiae n. sp. Cellulis vegetativis dense aggre- 
gatis, pulvinulos formantibus, margine tenues, centro crassiores; 
cellulis marginalibus subsphaericis, circa 2 u diam.; cellulis partis 
centralis clavatis, ellipsoideis vel subeylindricis, 4-8 x 2-3 u; tegu- 
mento communi gelatinoso pulvinulum  vestiente; colore laete 
violaceo vel purpureo; gonidangiis late ovoideis vel subsphaericis, 
ad 12 y diam., gonidia minuta includentibus. 
Vegetative cells densely compacted, forming pulvinulate expan- 
sions, thin at the margin, thicker at the center; marginal cells sub- 
spherical, about 2 u diam.; cells of the middle part clavate, ellipsoid 
or subcylindrical, 4-8 x 2-3 u; a general gelatinous coating covering 
the expansion; color light violet or pink; gonidangia broadly ovoid 
or subspherical, up to 12 u diam., containing many minute gonidia. 
On fronds of Dictyopteris delicatula Lamour., Barbados, Miss Anna 
Vickers. Type in herb. F. S. C.; cotype material distributed as 
P. B.-A., No. 1602. 
By the kindness of the members of the family of the late Miss 
Vickers, there was sent to the writer a very full collection of algae 
from Barbados, including nearly all the species mentioned. in Miss 
Vickers’s publications on the flora of that island? a number of them 
in sufficient quantity for distribution in the, Phycotheca Boreali- 
Americana. On looking over a set of Dictyopteris delicatula for 
1 Collins, The green algae of North America. Tufts College Scientific Studies, 
Vol. II, p. 79. 
? Vickers, Liste des algues marines de la Barbade. Ann. Sci. Nat., Ser. 9, Bot., 
Vol. I, p. 45, 1905. 
Phycologia Barbadensis, Paris, 1908. 
