412 BOTANICAL GAZETTE [JUNE 
stout or usually somewhat slender, tapering more or less promi- 
nently to the bluntly pointed apex. Cysts go-300 X 20-50 #. 
Rods 4—6 X I-I.3 p. 
On hepatics on trunks of living beech trees, Crawfordsville, Indiana. 
This species, which was kindly communicated by Dr. E. W. Olive, though 
unlike any other species of Chondromyces in general habit, is very similar in 
shape to some forms of Myxococcus coralloides ; from which it differs, how- 
ever, in its bright color, and more slender form, as well as by the absence of 
spores. It varies considerably in shape,’from stout, bluntly rounded, to 
slender, more or less attenuated forms. 
Myxococcus disciformis, nov. sp. Plate XXVII, figs. 19-21. 
Cysts disk-shaped, crowded, sessile, attached by a more or 
less ragged scar-like insertion, or irregularly heaped in masses; 
at first faintly pinkish, becoming pale dull orange-yellow; cir- 
cular to oval or somewhat irregular in outline; the cyst wall dis- 
tinct, thin, becoming very slightly wrinkled. Cysts about 
30-35 X 10m. Rods 2-3 X0.5-0.6m. Spores irregularly spheri- . 
cal, hardly distinguishable in the tenacious matrix. 
On muskrat dung from Stony Brook, Mass., and on deer dung from New 
Hampshire. 
- This well marked species, clearly distinguished by its color and disk- 
shaped cysts, has appeared twice on laboratory cultures, and is one of the 
most minute members of the group. At the period of cyst formation the rod 
often heap themselves in masses of varying size, and in these masses the 
cysts become differentiated by secondary aggregation somewhat as in Poly- 
angium, so that many of them mature quite free from the substratum and thus 
lack the more or less characteristic scar corresponding to their insertion 
(fig. 19, x). In other cases the pseudoplasmodium appears to spread itself 
over certain areas of the substratum, which thus become powdered with a mul- 
titude of sessile cysts. The pale orange color is assumed only after the cysts 
are well matured, and seems due to a thin, papery, slightly wrinkled wall, 
within which the spores cohere in a matrix as tenacious as in the most char- 
acteristic cysts of Chondromyces, and in which it is only with great difficulty 
that the colorless rounded spores can be distinguished after crushing, even 
when examined with the highest objectives. Like W. cruentus, this species 
may thus be looked upon as representing a transitional condition between the 
Myxococcus and the Chondromyces types. 
Polyangium septatum, nov. sp. Plate XXVII, figs. 25-28. 
Sori yellowish-orange, becoming dull red-crange when dry, 
very variable in size, from fifty to several hundred p» in diameter, 
