Rost., _Mon._, p. 93, in part.
1875. _Physarum affine_ Rost., _Mon._, p. 94.
1909. _Physarum compressum_ Alb. & Schw., Torrend, _Fl. des Myx._,
p. 197.
1911. _Physarum compressum_ List., _Mycetozoa, 2nd ed._, p. 70.

Sporangia more or less scattered, _compressed_-globose, or
compressed-reniform, i. e. often umbilicate, stipitate, sessile, or
elongate as if plasmodiocarpous, calcareous, white or ashen; peridium
thin, covered with squamules, opening irregularly, usually by apical
cleft; stipe, when present, short, stout, more or less sulcate, dark
brown or ashen; capillitium a rather loose net, the nodules white,
variable in size and shape; spores purplish-brown, delicately roughened,
about 10-12.5 mu.

_P. affine_ R. was in this connection set up for European types
compressed indeed, but more strongly _reniform_. The author says in his
further description that the form _affine_ is less definitely
umbilicate, has white stems, etc.; allantoid, one would now say. Such
forms now begin to appear in America; and if for these a specific name
is needed, it is provided, _P. affine_ Rost., Plate XIX., Fig. 4.

This seems to be a cosmopolitan species, now that we have found it.
However, in North America it is rare. It is reported from Pennsylvania,
from Colorado; Harkness found it in California, and the writer has often
collected it in Oregon, on Mt. Rainier, Washington, and in California.
Europe.

39. PHYSARUM NOTABILE _nom. nov._

PLATE IX., Figs. 2, 2 _a_, 2 _b_; PLATE XV., Fig. 2; and Frontispiece.

1873. _Didymium connatum_ Peck, _Rep. N. Y. Mus._, XXVI., p. 74.
1879. _Physarum polymorphum_ (Mont.) Rost., Peck, _Rep. N. Y. Mus._,
XXXI., p. 55.
1893. _Physarum leucophaeum_ Fr., Ellis, _N. A. F._, No. 2396,
_second exhibit_.
1893. _Physarum leucophaeum_ Fries, Macbr., _Bull. Lab. Nat. Hist.
Iowa_, II., p. 156.
1894. _Physarum compressum_ Alb. & Schw., List., _Mycetozoa_, p. 53,
in part.
1896. _Physarum connexum_ Link., Morg., _Jour. Cin. Soc._, p. 92,
in part.
1896. _Physarum confluens_ Pers., Morg., _l. c._, p. 94.
1899. _Physarum nefroideum_ Rost., Macbr., _N. A. S._, p. 41, in part.
1911. _Physarum connatum_ Lister, _Mycetozoa, 2nd ed._, p. 71.

Sporangia gregarious, sessile, stipitate, or even plasmodiocarpous; when
stipitate, depressed, varying at times to irregular reniform in the same
colony; globose, the peridium stro