is
doctor's thesis, nearly thirty years later, draws a similar parallel but
ignores the great French author, writing _S. ferruginea_ Ehr. as though
the thing had never been seen before! By this name it has been called
until very lately; Fries accepting it, but noting that the plasmodium,
for him at least, was _yellow_!

In 1904 Dr. E. Jahn, following Fries' suggestion, established the fact
that Ehrenberg's white-plasmodic species had small spores, that Fries
had in mind a form with larger spores, having indeed yellow plasmodium;
but see number 13 below.

It is for the present assumed that the plasmodium of our American _S.
axifera_ is white. So far, there are few or no observations which
establish the fact. The color, the small smooth spores, the fine-meshed
capillitial net and the general dimensions determine the reference.

13. STEMONITIS FLAVOGENITA _Jahn._

PLATE XX., Figs. 10, 10 _a_, 10 _b_.

1829. _Stemonitis ferruginea_ Ehr., Fries, _Myc._ III., p. 158,
Syn. excl.
1899. _Stemonitis axifera_ (Bull.) Macbr., _N. A. S._, p. 120,
in part.
1904. _Stemonitis flavogenita_ Jahn, _Abh. Bot. Ver. Brandenb._,
XLV, p. 265.
1911. _Stemonitis flavogenita_ Jahn, List., _Mycetozoa, 2nd ed._,
p. 149.

Sporangia cylindric, obtuse, closely fasciculate, "cinnamon brown,"
stipitate, 5-7 mu; stipe short, black, columella ceasing abruptly below
the apex; capillitium a loose net-work with many broad expansions; the
peridial net very delicate, the meshes small but uneven, 6-15 mu, with
many projecting points; spores pale ferruginous, verruculose, 7-9 mu.

This is _S. ferruginea_ Ehr. of Fries with its plasmodium yellow. Fries
says "flavicat," _becomes_ yellow, if one may follow the analogy of
corresponding Latin verbs of color, so that the record of color-changes
in the present species is yet to be recorded.

Until further experience may advise to the contrary, we may assume that
all stemonites cinnamon-brown in color, with widened columella-tip, and
pale yellowish spores 7-9 mu in diameter, have at some time in their
history a yellow plasmodium, and accordingly represent in America the
new-found species.

The larger spores, and, the strange proliferate development of the
columella-tip, to which Miss Lister has happily called attention,
constitute the essential diagnostic features here.

Our only specimens so far are from Oregon.

14. STEMONITIS PALLIDA _Wingate