Figs. 2, 3, 4.--Diagrammatic representation of the structure of Tubulina

Fig. 5.--Lycogala conicum, Pers., natural size

Fig. 6.--Lycogala exiguum, Morgan, n. sp., natural size

Fig. 7.--Lycogala epidendrum, Buxb., natural size

Fig. 8.--Lycogala flavofuscum, Ehr., natural size

Fig. 9.--Portion of tubule of Lycogala flavofuscum

Fig. 10.--Reticularia splendens, Morgan, n. sp., natural size

Fig. 11.--Cribraria cuprea, Morgan, n. sp.

Fig. 12.--Dictydium longipes, Morgan, n. sp.

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

VOL. XV. PLATE III.]

* * * * *

From the Journal of the Cincinnati Society of Natural History, April,
1893.

THE MYXOMYCETES OF THE MIAMI VALLEY, OHIO.

BY A. P. MORGAN.

Second Paper.

(Read May 2, 1893.)

ORDER III. PERICHAENACEAE.

Sporangia sessile or plasmodiocarp; the wall a thin membrane, with a
more or less thickened outer layer of minute brownish scales and
granules. Capillitium of long and very slender tubules, proceeding from
numerous points of the sporangial wall, loosely branched, forming no
evident network, the surface minutely warted or spinulose. Spores
globose, oval, or somewhat irregular, yellow.

The order is distinguished by the sessile sporangia, with thick brown
walls, and the very slender threads of the capillitium, with irregular
and indefinite markings.

TABLE OF GENERA OF PERICHAENACEAE.

1. PERICHAENA. Sporangia more or less depressed, roundish or more
commonly polygonal and irregular, dehiscent in a circumscissile manner.

2. OPHIOTHECA. Plasmodiocarp terete and more or less elongated, bent and
flexuous, sometimes annular or reticulate, irregularly dehiscent.

I. PERICHAENA, Fr. Sporangia more or less depressed, roundish or more
commonly polygonal and irregular, the edges approximate and sometimes
confluent; the wall a thin membrane, with a thick dense yellow-brown
outer layer of minute scales and granules, becoming darker at the
surface, dehiscent in a circumscissile manner. Capillitium of very
slender loosely-branched threads, with the surface minutely warted.
Spores globose, oval or somewhat irregular, yellow.

Distinguished from Ophiotheca by the flattened sporangium with a regular
circumscissile dehiscence.

1. PERICHAENA DEPRESSA, Lib. Sporangia very much depressed, polygonal,
irregular, crowded, the edges contiguous, sometimes conflu