OLIVE : MONOGRAPH OF THE ACRASIEAE. 
501 
Guttulinopsis clavata Olive. Plate 5, fig. 20-22. 
Proc. Araer. acad. arts and sci., vol. 37, p. 336, 1901. 
Sori yellowish white when young, comparatively long stalked, 
the stalk composed of a column of slightly elongated individuals 
surrounded by mucus. The stalk cells held within the peripheral 
mucus, adhere together after the deliquescence of the pseudospores 
of the head, forming at the apex a rounded or conical columella of 
elongated, adherent cells. Sorus about 400 />t-800 fx in height, the 
stalk about 170 /a-250 fx long, the head 100 />i-400 fx in diameter. 
Pseudospores of the head somewhat broadly oval, 3 /x-4 p- by 6 fx-l fx, 
or spherical, then 4 /x-5 fx in diameter; those of the stalk about 3 fx 
—5 IX by 7 fx—lO fx. 
On dung of dog. Cambridge, Mass. ; Indiana. 
This distinct species has been frequently met with in fresh cul¬ 
tures of the dung on which it has its habitat. The base of the stalk 
furthermore, is often imbedded in an abundant mucus, which is 
especially noticeable when it swells after being placed in the water. 
Although the diiferentiation in shape seen in the individuals of the 
stalk is indeed slight, such a phenomenon, nevertheless, serves to 
suggest the possible beginnings of stalk differentiation leading to 
the complicated conditions observed in the Dictyosteliaceae. 
Guttulina Cienkowsky, 1873. 
Plate 5, fig. 23-24, 27-39. 
Trans, hot. sec. 4th meeting of Russ. nat. at Kazan, 1873. 
Myxamoebae normally limax shaped, without pseudopodia. Sori 
irregular in shape or spherical, sessile or stalked, composed of spores 
which have a definite protective cell wall. The cells of the stalks 
somewhat differentiated in shape. 
Guttulina rosea Cienkowsky. 
Trans, hot. sec. 4th meeting of Russ. nat. at Kazan, 1873. 
^^Sori short stalked and rose colored; head 700 /x long, supported 
upon a stalk of about equal length. Spores of the head spherical; 
those of the stalk closely laid and wedge shaped.” 
On dead wood. Russia. 
