olumella, the whole
structure involute and plicate, short stipitate, recalling the extremest
complexity of such a species as _P. polycephalum_. _Vid._ Pl. XVI., Fig.
6. Moreover, in these specimens the calcareous deposits are white and
not yellow, giving the entire fructification a grayish aspect. Yet there
is no doubt we have here simply an exaggerated abnormality of the
species; the spores are identical in size, color, and surface.
Plasmodium bright yellow. Dr. Peck gave to his forms the name
_Physarella mirabilis_; but specimens sent by Michener of Pennsylvania,
and by Berkeley and Curtis described as _Trichamphora oblonga_ (_Grev._,
II., p. 66), are the same thing. _N. A. F._, 1212.

_Physarella lusitanica_ Torrend is a globose form depressed above or
betimes discoidal, occurring on Eucalyptus trees in Portugal. _P.
oblonga_ is so variable in form that it sometimes suggests a different
genus. Forms of it have been mistaken for _Fuligo gyrosa_ R., etc.
Professor Torrend would include here _Physarum javanicum_ (Rac.), i. e.
_Tilmadoche javanica_ as Raciborski saw it! We may not too often reflect
that genera are purely artificial things set up for our convenience; but
surely _Physarella_ as a natural genus is distinct enough to all.

=6. Cienkowskia= _Rost._

1873. _Cienkowskia_ Rost., _Versuch_, p. 9.

Fructification plasmodiocarpous, irregularly dehiscent, the wall a thin
cartilaginous membrane destitute of lime, except the capillitial
attachments within; capillitium scanty but rigid, and characterized
everywhere by peculiar hook-like branchlets, free and sharp-pointed, the
spores as in _Physarum_, etc.

The genus contains, so far, but a single species:--

CIENKOWSKIA RETICULATA (_Alb. & Schw._) _Rost._

PLATE XIV., Figs. 2, 2 _a_, 2 _b_.

1805. _Physarum reticulatum_ Alb. & Schw., _Cons. Fung._, p. 90.
1829. _Diderma reticulatum_ Fr., _Syst. Myc._, III., p. 112.
1873. _Cienkowskia reticulata_ (Alb. & Schw.) Rost., _Versuch_, p. 9.

Plasmodiocarp an elongated, irregularly limited, close-meshed net,
closely applied to the substratum, the wall thin, transversely rugulose,
and roughened, dull orange-yellow, splashed here and there with scarlet,
anon entirely red, within marked by transverse calcareous ridges,
supporting in part the calcareous system of the capillitium; capillitium
of delicate, rigid, reticulating yellow tubules or threads with numerous
free, uncinate or sickle-shaped branchlets, an