ecies, and so far there are
none reported from outside Ohio.

FOOTNOTES:

[15] For other crucifers, see _Bull. Torr. Bot. Club_, xxi, pp. 76-8.

[16] See in reference to this whole matter, _Myxomycetenstudien_ by E.
Jahn, No. 7, _Ceratiomyxa_, 1908. See also Olive, _Trans. Wis. Acad. of
Sci. Arts and Letters_, Vol. xv, pl. II, p. 771.

[17] See Jahn, _Myxomyceten Studien_ No. 8, Berlin 1911.

[18] In discussing these species the reader may be referred to Professor
Harper's study of cytology, _Bot. Gazette_, vol. XXX., p. 217. It is
probable that in all these aethalioid forms the effect of disturbance,
transfer to laboratory, is likely to be quite pronounced. Giant spores
are often seen, doubtless due to arrested cleavage in the procedure
described by Dr. Harper: a giant spore is penultimate or antepenultimate
in series; should, on this theory, occasionally, at least, show more
than one nucleus.

[19] Prior to Persoon the physarums were variously referred:
_Lycoperdon_, _Sphaerocarpus_, _Trichia_, etc. It seems unnecessary to
quote the synonymy further here.

[20] Persoon's first-named species is _P. aureum_; see _Roemer Neu. Mag.
f. d. Bot._, I., p. 88. 1794.

[21] Fries (_Sum. Veg. Scand._, p. 454) described the new genus in the
following words: Tilmadoche. Fr. Physari spec. S. M. Peridium simplex,
tenerrimum (_Angioridii_) irregulariter rumpens. Capillitium
intertexto-compactum, a peridio solutum liberum, sporisque inspersis
fuscis. Columella o.

1. T. leucophaea. Fr.

2. T. soluta. (Schum.)

3. T. cernua. (Schum.)

[22] See also _Inaug. Diss._, H. Roenn, _Schr. d. Naturw. Ver. f. Schl.
Holst._, XV., Hpt. I., p. 55, 1911.

[23] Inasmuch as there has been decided difference of opinion in
reference to this particular species,--all judges readers of the same
original description,--it has seemed wise to submit an English
translation from the celebrated _Monograph loc. cit._

"24. Physarum diderma _Rfski._

"Sporangia sessile, globose, adnate by a narrow base, white. Peridium
double; the outer thick, strongly calcareous, very distinctly set off
from the thin inner one by an air-filled space; the calcareous nodules
many, angular, loosely developed within to form a pseudo-columella;
spores dark violet, spinescent, 9.2-10 in diameter.

"_Opis._ This physarum looks extremely like a diderma.

"The sporangia stand either aggregated or bunched together in heaps of
five to twelve, adnate to the hypotha