ull brown 2. _D. corticatum_

_C._ Sporangia, some of them stipitate 3. _D. andersoni_

1. DIANEMA HARVEYI _Rex._

PLATE XVI., Figs. 5 and 5 _b_.

1891. _Dianema harveyi_ Rex, _Proc. Phil. Acad._, p. 397.

Sporangia gregarious, generally rounded or cushion-shaped, depressed,
sessile, iridescent bronze, 1 mm. in diameter; peridium thin,
translucent, opening irregularly; capillitium of simple threads, not
netted, but often forked two or three times, taut, running from base to
top; spores yellow, by transmitted light pale yellowish, minutely
roughened, 8-10 mu.

This interesting species was collected in Orono, Maine, in 1889, by
Professor F. L. Harvey, and so far as can be learned has not been taken
since. Mr. Lister records two species from England which he refers to
this genus. As to its systematic place, Dr. Rex says, _l. c._ "It stands
as a single representative of a new and separate family adjoining the
_Perichaenacae_ in the order _Calonemeae_ of Rostafinski."

Rare. Maine.

2. DIANEMA CORTICATUM _List._

PLATE XVI., Figs. 5 _a_, 5 _c_.

1894. _Dianema corticatum_ List., _Mycetozoa_, p. 205.

"Plasmodium pink"; sporangia sometimes flat-hemispheric, more often
ill-defined, united in irregular, depressed, netted plasmodiocarps,
generally dull brown; peridium opaque, didermatous, capillitium of
simple or rarely branching filaments, variously beaded or marked with
spiral bands, lightly attached at either end, occasionally twisted
together; spore-mass dull brown, the spores in clusters of four or more,
colorless by transmitted light, more or less verruculose, ellipsoidal,
about 8-10 mu.

Our specimens are from the mountains of Alberta.

A curious, flat plasmodiocarp, an inch or more in length. It suggests
_Hemitrichia serpula_ prematurely dry.

3. DIANEMA ANDERSONI, _Morg._

_Dianema andersoni_, _Morg._ MS., _non. pub._

Sporangium globose, sessile or sub-stipitate, seated on a thin brownish
hypothallus; the wall a thin smooth pinkish membrane, when dry rugulose
and iridescent, the inner surface somewhat thickened below and brownish
at the base. Capillitium arising out of the thickened base, the threads
hyaline or pinkish, ascending, flexuous, simple, or branched a time or
two, the extremities attached on all sides to the wall of the
sporangium. Spores globose, very minutely warted, pale, pinkish, 10-11
mu, in diameter, free.

Growing on