1918] Notes from the Woods Hole Laboratory — 1917. 143 
and the oogonium is patent, but not infrequently the seta does not 
develop, and in that case the oogonium is regularly erect. The near- 
est relative seems to be B. Brebissonii, but that species has larger 
dimensions, fewer-celled androsporangia, and less curved dwarf males. 
B. ELATIOR Pringsheim, not before recorded for America, also occurs 
in the Wood Pond material, and is of much the same dimensions as 
B. Furberae, but has oogonia more angular and with smooth epispore, 
and androsporangia epigynous. B. intermedia var. supramediana 
Hirn, already known in Massachusetts, also occurs, but it is a plant 
of larger dimensions than B. Furberac, with relatively shorter cells 
and higher dissepiments. 
MIKROSYPHAR PORPHYRAE Kuckuck, Bermerkungen zur marinen 
Algenvegetation von Helgoland, II, p. 381. This forms minute brown 
dots in the fronds of Porphyra umbilicalis (L.) J. Ag., ultimately 
destroying the infested portion of the latter, leaving a perforation in 
place of the Microsyphar colony. The filaments wind between the 
large cells of the host, branching more or less freely, with no erect 
filaments and no hairs. The fructification is of the simplest type, a 
single zoospore forming in the terminal cell of a branch, or a few zoo- 
spores forming each in a small cell partitioned off in such a terminal 
cell, constituting a very rudimentary plurilocular sporangium. It is 
fairly common, with various other epiphytes and parasites, at one or 
two stations at Woods Hole, and has not before been reported in this 
country. 
NostToc PUNCTIFORME Hariot ex Bornet & Flahault, Revision des 
Nost. Het., part IV, p. 189, 1888, was found throughout the summer 
at Tarpaulin Pond. It is so closely associated with Sphagnum sp. 
that it may be called symbiotic. Sometimes it is found on the surface 
of the leaves, but more usually it occurs inside the dead and otherwise 
empty cells so characteristic of Sphagnum. It is also found in the 
cells of the stem. The Sphagnum does not react visibly to the pres- 
ence of the Nostoc. N. punctiforme has been recorded, Forti, Syll. 
Myx., p. 388, as widely distributed in Europe, South America and the 
oceanic islands of the tropics as an epiphyte and endophyte on Lemna, 
in Gunnera and several lichens, and also on moist earth. From the 
United States it has been reported, Tilden, Minnesota Algae, p. 164, 
only as an endophyte in the roots of cycads, where it is associated 
with nodule formation and with a peculiar mode of growth of the 
roots.— F. S. Corns, North Eastham, Massachusetts. 
