Acrochaetium alcyonidii C. C. Jao

Acrochaetium Alcyonidiae Jao var. cylindricum, var. nov.
(pi. 12, fig. 5)
Filamentis endozoicis 5.0-6.5/i latís, cellulis 6.5-13/i longis; filamentis
crectis ad 300/i altis, cellulis 4-5¿u latis, 10-19/i longis; ramulis lateralibus
246	BULLETIN OE THE TORRKY CLUB	[VOL. M
brevissimis, longitudine 1—4-cellulis; monosporangiis cvlindrico-obovoideis,
plerumque terminalibus, raro lateralibus, 4.0-6.5/i latis, 9.5-13/i longis;
ceterum forma typica similis.
Endozoic filaments 5.0-6.5/i diameter, the cells 6.5-13/i long; erect fila-
ments up to 300/i tall, cells 4-5/x diameter, 10 -19/i long; branches very short
1-4 cells long; monosporangia cylindric-obovoid, usually terminal, rarely lat-
eral, 4.0-6.5/i diameter, 9.5-13/i long; otherwise as in the type species.
This variety differs from the type form of the species in having all cells
of lesser dimensions and the cylindric-obovoid monosporangia mostly
terminal on the very short branches. It also bears some resemblance to A.
strictum (Rosenvinge) Hamel and A. gracile Bjzirgesen, but differs from both
in having an endozoic habit; furthermore, the first has greater dimensions
of all cells, the branches are longer and hairs are present, and the second
has filaments with long branches which taper toward the tip and often
end in long hair-like prolongations, and has larger sporangia.
Growing on Alcyonidium Mytili Dalyell mixed with Acrochaetium
Alcyonidiae Jao, and partly endozoic, washed ashore in Sheep Pen Harbor,
Sept. 1, 1934. Type in C.-C. Jao collections and Herb. Univ. Mich., Woods
Hole No. 279: B.
rz.xrr
Fig. 5. Acrochaetium Alcyonidiae Jao var. cylindricum Jao. var. nov. X360.
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