me also to this table. The material
was scanty, in poor condition, and all waited further light. To these
specimens the writer paid less attention. They were in the hands of his
correspondents and the courtesy of the case required their further
consideration by Dr. Rex.

In 1889 Mr. Holway found in Iowa, a physarum of which he sent part to
Ellis and the remainder to the writer who, then engaged on the
_Myxomycetes of East. Iowa_, referred his part of this Iowa gathering
to the _Physarum auriscalpium_ Cke. as found in New York. Under this
caption a specimen was later sent to Mr. Lister, who has, as we see,
consistently regarded the thing as a variety of _P. virescens_ Ditmar,
_P. nitens_ List.

Meantime in 1898 Colorado material from Professor Bethel reached the
University. This did not recall any of the materials sent from Ellis.
_Diderma albescens_ had meanwhile come again from California, and been
recognized as _Diderma niveum_ Rost.

Accordingly, in _N. A. S._ the latest arrival from Colorado was
described as a new species, and with some temerity perhaps, offered as a
second species of the hitherto monotypic _Leocarpus_, all on account of
the peculiar capillitium. Sometime after publication our most valued
correspondent Mr. Bilgram called attention to the resemblance between
the Colorado and Louisiana material already referred to. The University
specimens as stated were small, broken, and in every way poor, but
enough remained to indicate the evident justice of our correspondent's
suspicion. Further investigation of the Holway material in Philadelphia
showed that _it too was entitled to consideration_! Inasmuch as the
Holway sending was all from one plasmodium, all difficulties vanished at
once. The Iowa gathering showed two phases: one at the University
represents _P. nitens_, physaroid, single-walled; while the Philadelphia
part of the gathering corresponds, poorly it is true, but in fact, as
_now_ appears, to the form coming in perfection from Colorado;
leocarpine in structure, published as _Leocarpus fulvus_; _P. fulvum_
Lister. Since the combination _P. fulvum_ is already in use, synonym of
_P. rubiginosum_, it seems better to write the name suggested by Ellis;
_Physarum albescens_ never having been published, because _Diderma
albescens_, as noted took care of itself.

Since Rostafinski we separate all these physaroid forms chiefly by
capillitial characters: capillitial structure separates genera.
_Physarum