orm particularly well-defined. What the
value of plasmodic color as a specific character in general, and how far
such character is in the present case definitive, because constant, are
points yet to be determined.

4. FULIGO INTERMEDIA _Macbr. n. s._

Aethalium two to three cm. in greatest diameter, .5-1 cm. thick, covered
with a thin, fragile, but not calcareous, greyish or brownish cortex;
the spore-mass grey or violaceous-grey, firm, not at all sooty, the
sporangia intricate, their walls more or less calcareous; capillitium
not conspicuous; spores globose, pale purple, slightly roughened, 10-12
mu.

This form has been repeatedly sent me from Denver, Colorado, by
Professor Bethel. I have refrained from publishing it, still anxious to
believe that all fuligos on the face of the earth were of one species.
In the species next following it must be admitted that the
spore-variations are too wide to remain comfortably under shelter of a
single specific name. The present species is not _F. septica_, neither
is it _F. megaspora_; it is _F. intermedia_.

Colorado; Iowa.

5. FULIGO MEGASPORA _Sturg._

1913. _Fuligo megaspora_ Sturg., _Col. Coll. Pub._, p. 443.

Aethalium pulvinate one to three inches in diameter, covered with a thick
spongy incrustation of lime, white or yellowish toward the base:
sporangia convolute, the walls membranous, brittle, charged throughout
with round white granules of lime, 1.5-2 mu in diameter: columella none:
capillitium of delicate, colorless, anastomosing tubules, bearing toward
the center large, white, branching calcareous nodules; spores spherical,
or somewhat oval, dark purple-brown, rough-tuberculate, 15-20 mu.

This species differs as pointed out by Professor Sturgis, chiefly in the
character of the spores, their unusual size and roughness.[18]

Colorado; Africa!--_Robert Fries._

=EXTRA-LIMITAL=

=Erionema= _Penzig_

1898. _Erionema_ Penzig, _Die Myx. d. Fl. v. Beutenzorg_, p. 36.

Sporangia plasmodiocarpous but distinct, cylindrical; capillitium
intricate, elastic; nodules few.

1. ERIONEMA AUREUM _Penzig_

1898. _Erionema aureum_ Penz. _l. c._

Sporangia elongate, clustered, pendulous, yellow or grayish yellow,
generally stipitate on long flaccid stalks, or sessile and interlacing:
stipes yellow, blending with the hypothallus; capillitium intricate,
expanding at maturity after the manner of _Arcyria_ to several times the
sporangial length, the nodul