mu in diameter; spores minutely warted, 7-9 mu, violaceous-brown.

The defining characteristics here are the curious supplementary
vesicles. These are evidently plasmodic, embraced, shot-through, by all
the neighboring capillitial threads, withal warted like a spore. They
remind of the curious, belated, spore-like but giant cells found in
stipes, as in arcyriaceous forms. With all the wealth of his prolix,
poetic, metaphoric tongue, the Polish author gives them abundant
consideration. In the _Mon._, Tab. IX., Figs. 166 and 180, he clearly
shows the structure, although in the explanation of the plate he has
strangely mixed this species with _D. crustaceum_ Fr. Under _D. serpula_
Fries may refer to the present species, although there is nothing in his
description to determine the fact. The same thing may be said of the
description and figures of Batsch. Rostafinski, in the _Monograph_,
seems to have been satisfied as to the identity of Batsch's materials:
in the _Appendix_, he writes _D. serpula_, but gives no reason.

Rare. New York. England, France, Germany.

2. DIDYMIUM ANELLUS _Morgan._

PLATE XVIII., Fig. 7.

1894. _Didymium anellus_ Morgan, _Jour. Cin. Soc._, p. 64.
1899. _Didymium anellus_ Morg., Macbr., _N. A. S._, p. 85.
1911. _Didymium anellus_ Morg., Lister, _Mycetozoa, 2nd ed._, p. 134.

Plasmodiocarp in small rings or links, then confluent and elongated,
irregularly connected together, bent and flexuous, resting on a thin
venulose hypothallus, or sometimes globose, the peridium dark colored,
with a thin layer of stellate crystals, irregularly ruptured;
capillitium of slender, dark-colored threads, which extend from base to
wall, more or less branched, and combined into a loose net; columella a
thin layer of brown scales; spores globose, very minutely warted,
violaceous, 8-9 mu.

This minute species resembles a poorly developed, or sessile, phase of
_D. melanospermum_. Some of the sporangia (?) are spherical; such show a
very short dark stalk. The columella is scant, and the spores are
smaller than those of _D. melanospermum_.

Ohio. Reported more recently from Europe and Ceylon.

3. DIDYMIUM WILCZEKII _Meylan_.

1908. _Didymium wilczekii_ Meyl., _Bull. Soc. Vaud. Sci. Nat._,
XLIV., p. 290.
1911. _Didymium wilczekii_ Meyl., List., _Mycetozoa, 2nd ed._, p. 134.

Plasmodiocarpous, dehiscing irregularly, columella scant; capillitium
abundant, the threads brown, anastomosing