The Myxomycetes of the Miami Valley, Ohio. 



9 



spores color the paper violet. Physarum pulcherriwnim B. & 

 Rav., and P. atrorabrum Peck. 



2. Cytidium citrinum Schum. Sporangium globose, the 

 base slightly flattened or umbilicate, stipitate ; the wall a thin 

 membrane, covered with small scales of lime, yellow or green- 

 ish-yellow, breaking up and falling away at maturity. Stipe 

 stout, erect, yellow, longitudinally rugulose, expanded at the 

 base, tapering upward and entering the sporangium as a short 

 obtusely conical columella. Capillitium of slender tubules, 

 forming a dense net-work, with slight expansions at the angles; 

 the lime-nodules numerous, roundish or ellipsoidal, variable 

 in size, yellow. Spores globose, nearly smooth, violaceous, 

 7-8 mic. in diameter. 



Growing on bark, leaves, mosses, etc. Sporangium .5-6 

 mm. in diameter, the stipe from once to twice this length. 

 This, the typical species, I have not seen in this country, but 

 forms with the sporangium lemon-yellow and grayish-yellow, 

 with the stipe golden-yellow, connect it with C. rufipcs. It is 

 Physarum citrinum Schum. Diderma citrinum of Fries., S. M. 



3. Cytidium rufipes A. & S. Sporangium globose, some- 

 times a little depressed and- the base umbilicate, stipitate; 

 the wall a thin membrane, covered with small scales of lime, 

 golden-yellow to orange in color, breaking up at maturity 

 and falling away. Stipe variable in length, slender, from 

 orange or orange-red to dark red in color, sometimes blackish 

 below, rising from a thin hypothallus, tapering upward and 

 entering the sporangium as a short obtuse columella. Capilli- 

 tium of slender tubules, forming a dense net-work of very 

 small meshes, slightly expanded at the angles; the nodules 

 of lime small, numerous, ellipsoidal or obtusely angular, 

 orange to red in color. Spores globose, nearly smooth, viola- 

 ceous, 8-10 mic. in diameter. 



Growing on old wood, mosses, etc. A very abundant 

 species. Sporangium .5^.7 mm. in diameter, the stipe from 

 once to twice as long. As here defined, the species includes 

 Physarum aurantium var. rufipcs A. & S., and Physarum 

 aureum var. chrysopas I^ev, which I am unable 'to keep sep- 

 arate; the variation in size of the spores is not in correspond- 

 ence with the variations in color of the sporangia. Physarum 



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