20 
OHIO BIOLOGICAL SURVEY 
knots connected by short hyaline threads. Spores pale brown, minutely 
warted, 8 to lOmmm. in diam. 
(Miama Valley—Morgan). 
3. C. leucocephalum TPers.) Ditm. Sporangia gregarious, ovate, 0.5 
to 0.6mm. in diam., white above, red brown below, stalked. Lid indistinct, 
convex, white. Sporangium wall thin, double, mealy from deposits of lime. 
Stalk cylindrical, furrowed, brown. Capillitium of large white or yellowish 
branching hyaline threads. Spores violet brown, minutely spinulose, 8 to 
9mmm. in diam. 
Common. 
4. C. minimun Berk, and Curt. Sporangia gregarious, cylindrical, 
small, nearly white, with a brown base. Lid indistinct, convex. Spor¬ 
angium wall thin, double, mealy from deposits of lime. Stalk short, 
cylindrical, furrowed, brown. Capillitium of large white lime knots 
connected by hyaline threads. Spores violet brown, minutely spinulose 8 
to 9mmm. in diam. 
Common. 
5. C. aureum (Schum.) Rost. Sporangia gregarious, globose or 
obovoid, 0.4 to 0.6mm. in diam., yellow, without a definite lid. Sporangium 
wall thin, single, the upper part breaking up irregularly at maturity leaving 
the lower part as a cup. Stalk cylindrical, stout, furrowed, orange or 
yellow. Capillitium of yellow irregular lime knots connected by a network 
of hyaline threads. Spores violet brown, minutely spinulose, 8 to 
9mmm. in diam. 
This species is closely related to certain species of the genus Physarum 
and could with equal propriety be placed in that genus. 
Common. 
6. CIENKOWSKIA Rost. 
Cienkowskia reticulata (A. & S.) Rost. Plate III, Fig. 1, la, and lb. 
Sporangia forming branching net like plasmodiocarps. Sporangium 
wall without lime. Capillitium of plates of lime attached to the inner 
sporangium wall and connected by a rigid network of threads which have 
many free curved sharp pointed branchlets. 
1. C. reticulata (A. & S.) Rost. Sporangia sessile forming an elongated 
net like plasmodiocarp, 0.5mm. in diam., orange yellow, - blotched with 
crimson, transversely ridged. Sporangium wall double. Columella absent. 
Capillitium consisting of an elastic network of flexuose rigid yellow threads 
with numerous free, pointed, curved, branchlets, and of lime in the form 
of flat perforated pale yellow plates disposed transversely to the axis of the 
sporangium and connected by broad or narrow attachments to the 
sporangium wall, occasionally with irregular lime knots intermixed. 
Spores violet brown, minutely spinulose, 9 to llmmm. in diam. 
(Miami Valley—Morgan). 
