338 
sent me by Miss Laura Jernegan of Edgartown, Mass., I found 
an £ctocarpus, collected by her at Edgartown, which I have little 
doubt belongs to the long lost species. It is a delicate plant, 
considerably resembling in color and habit £. confervoides, vat. 
stliculosus, but the branching is more patent, especially at the 
tips, where the ramuli are quite densely set, something like 
fasciculatus, except that in E. Mitchelle they are more divari- 
cate. The plurilocular sporangia are quite distinct from any 
other of our species, being elliptic oblong or almost cylindrical, 
quite sessile, and obtuse, arranged in series on the upper side of 
the branches. It is, however, not improbable that it may be 
identical with Z. vérescens, Thuret ; but in that case Thuret’s 
name would have to give way to Harvey’s, which has the priority. 
£.. Sandrianus, Zan., is nearly allied, but as far as I can judge © 
from figures and herbarium specimens, the two are distinct. 
Pylaiella littoralis (L.) Kjellm., var. fluviatilis, Hauck. The 
species is very common and variable, but I have only once met 
with this variety, which I found in a ditch in Mystic River 
marshes, Mass. It is softer and more delicate than the type, 
and is characterized by: the very long plurilocular sporangia, 
little if any wider than the branches on which they grow. In 
my specimens they sometimes reach a length of a millimeter, 
and are often terminal, in that case reminding one of Ectocarpus 
confervoides. It is not impossible that 2, /ongifructus, Harv. 
may be properly referred to this variety. 
Ascocyclus globosus, Reinke. The genus Ascocyclus has been 
separated by Magnus from Myrionema, on account of the form- 
ation of the sporangia from the terminal cells of the upright 
filaments or from their branches, while in Myrionema they are 
borne directly on the basal layer. In A. globosus they are 
formed by transformation of the branches. Colorless jointed 
hairs, rather larger than the upright filaments, are distributed 
among the latter, rising from the basal layer. This is one of the 
larger species of the genus, and forms hemispherical or spher- 
ical tufts, large enough to be visible to the naked eye, on various 
filiform alge. I have found it at Nahant, Mass., on old fronds 
of Chetomorpha Melagonium. Described in Reinke, Algen- 
flora, etc., p. 46, and figured in the Atlas, Tab. xvii. 
