the somewhat indefinite,
characteristic color. As this is no valid reason for change, we have
restored Berkeley's specific name, which by general consent has
priority. _N. A. F._, 3299.

Not common. New Jersey, Ohio, South Carolina, Iowa.

52. PHYSARUM BETHELII (_Macbr._) _Lister_.

1899. _Tilmadoche bethelii_, Macbr., _Exempl. ad Herbaria._
1911. _Physarum gyrosum_ Rost., List., _Mycetozoa, 2nd ed._, p. 75.

Sporangia scattered, globose, umbilicate below, .5-1 mm. in diameter,
iridescent blue, or sometimes tinged by the presence of delicate pale
yellow calcareous scales, stipitate; stipe rather short, black or dark
brown, equal; capillitium dense, radiating from the black, slightly
intrusive summit of the stipe, and from the base of the peridium
ascending; the nodules not numerous, elongate, branching betimes, pale
yellow; spores minutely roughened, 10-12 mu.

This beautiful delicately tinted little species is clearly tilmadochoid
in the Friesian sense. The capillitium persists after the fall of the
upper filmy peridium, adherent below to the persisting peridial base.
Collected thus far twice only; by Professor Bethel and by Professor
Sturgis, Colorado.

SECTION 2

_=Tilmadoche= Fries_

53. PHYSARUM GYROSUM (_Rost._) _Jahn._

1875. _Physarum gyrosum_ Rost., _Mon._, p. 111.
1902. _Physarum gyrosum_ Rost., Jahn, _Ber. Deutsch. Bot. Ges._, XX.,
p. 272, t. XIII.
1911. _Physarum gyrosum_ Rost., List., _Mycetozoa, 2nd ed._, p. 75.

Sporangia gyrose, variable in form, or plasmodiocarpous and irregular,
venulose, sessile upon a common, strongly developed hypothallus,
sometimes isolated and irregularly globose, dehiscing irregularly or by
longitudinal fissure, yellowish or greyish white; columella none;
capillitium delicate, the nodules elongate, variable in size; spores
pale violaceous, minutely spinulose, 7-10 mu.

This is a European species recently resuscitated by Dr. Jahn. It perhaps
might more correctly be recorded as _P. gyrosum_ Jahn, since Rostafinski
certainly attempted in his description to cover two apparently distinct
things. He seems to have had before him _Fuligo muscorum_ Schw. and "_P.
gyrosum_," but he thought them the same, and his description touches now
one, now the other. Since _F. muscorum_ Schw. has all along held its own
and received due recognition, it is interesting to note the recovery of
this gyrose form.

Judging by description and figures, it resembles