rolonged nearly
to the apex as a slender columella. Capillitium of very slender tubules,
radiating from numerous points of the columella, forming a delicate
net-work of very small meshes, scarcely expanded at the angles; the
nodules of lime small, not numerous, roundish or obtusely angled, white
or yellowish. Spores globose, very minutely warted, pale violaceous,
5.5-6.5 mic. in diameter.

Growing on old wood. A rare and singular species. Sporangium .5-.7 mm.
in height by .3-.5 mm. in diameter, the stipe two or three times the
height of the sporangium. There is an affinity between this species and
the _Physarella_. The obscure _Tilmadoche hians_ Rost., may be the same
as the present species.

EXPLANATION OF PLATE XIII.

Fig. 49.--Angioridium sinuosum, Bull. _a._ Plasmodiocarp x 5 _b._
Capillitium and spores x 500.

Fig. 50.--Cienkowskia reticulata, A. & S. _a._ Plasmodiocarp x 5. _b._
Piece of plasmodiocarp x 90. _c._ Capillitium and spores x 500.

Fig. 51. Leocarpus fragilis, Dicks, _a._ Sporangia x 5. _b._ Capillitium
and spores x 500.

Fig. 52.--Leocarpus caespitosus, Schw. _a._ Sporangia x 5. _b._
Capillitium and spores x 500.

Fig. 53.--Physarella oblonga, B. & C. _a._ Sporangia x 5. _b._ Sporangia
x 90. _c._ Capillitium and spores x 500.

Fig 54--Cytidium penetrale, Rex. _a._ Sporangia x 5 _b._ Sporangia and
columella x 90. _c._ Capillitium and spores x 500.

Fig. 55.--Cytidium globuliferum, Bull. _a._ Sporangia x 5. _b._
Sporangia x 90. _c_. Columella x 90 _d._ Capillitium and spores x 500.

[Illustration: The Journal of the Cin. Soc. Natural History.

VOL. XIX. PLATE XIII.

MORGAN ON MYXOMYCETES]

VI. CRATERIUM, Trent. Sporangium obovoid to cylindric, stipitate; the
upper and usually greater part of the wall covered with granules of
lime, the basal portion naked and more persistent. Stipe short or
sometimes elongated, arising from a small circular hypothallus,
longitudinally plicate, confluent above and similarly colored with the
base of the sporangium. Capillitium of tubules, forming a loose network,
bearing numerous large angular and irregular nodules of lime, which are
often confluent along the axis of the sporangium into a
pseudo-columella. Spores globose, minutely warted, violaceous.

In this genus the sporangium is commonly obovoid, with a naked base
which is confluent with the stipe and similarly colored; after
dehiscence there is left behind th