1904] THAXTER: NOTES ON MYXOBACTERIACEAE 411 
flattened distally, where the papery cyst wall may be creased 
or folded so as to produce a more or less conspicuously roughened 
appearance; the base somewhat narrower, more or less wrinkled, 
passing with various degrees of abruptness to the pedicel, which 
is usually relatively long, slender, and shriveled. Cystophore 
about 300-700 in height, the head 150-500m in diameter. 
Cysts about 45-60 X 30-40 w, their pedicels often 40-60 » long. 
Rods of rising pseudoplasmodium 2-4 X 0.6-0.7 p. 
On goose dung from Sandy Run, S. C. 
This species was first brought to my attention by my assistant, Mr. J. J. 
Wolfe, who found a few of its fructifications appearing on a laboratory cul- 
ture. I have kept it in cultivation for more than a year and have thus been 
able to determine the constancy of the characters which seem to distinguish 
it very clearly from C. crocatus, or others of its nearest allies. In a saturated 
atmosphere its growth becomes very irregular, the cysts assuming a sub- 
cylindrical form, the portion of the ultimate rod-mass which is usually emptied 
to form the long pedicel encysting with little contraction, as shown in figs. 6 
and zz. Under normal conditions, however, the peculiar form shown in figs. 
8,9, 22, and 7? appears to be very constant. 
Chondromyces sessilis, nov. sp. Plate XXVIII, figs. 14-15. 
Reddish-orange. Cysts forming a sessile rosette or tuft on 
the substratum without any clearly differentiated -cystophore ; 
the individual cysts very variable in shape, irregularly broadly 
fusiform, often subapiculate, the surface somewhat wrinkled, 
very irregular in size, coherent at the base or more or less com- 
pletely confluent into irregular masses. Cysts 18-55 X 25-75 m, 
average about 40 X 55m. Diameter of rosettes about 100-2504. 
On rotten wood near Miami, Florida. 
This species was found in the hammock immediately south of Miami, and 
has the general appearance of C. aurantiacus to the naked eye. It is very 
irregular in its mode of growth, and specimens occasionally occur in which 
there seems to have been an attempt to differentiate an irregular cystophore. 
The rosettes can be removed 7 ¢oto from the substratum, and when examined 
from the under side show the irregular area of insertion clearly differentiated 
from the cyst surface (fig. 75). Though often very variable and misshapen, 
the cysts are normally shaped like those shown in fig. 74, and always cohere. 
Chondromyces muscorum, nov. sp. Plate XXVIII, figs. 16-18. 
Bright yellow-orange. Cysts simple or rarely furcate, sessile 
without any differentiated cystophore, erect, variously elongated ; 
