The Myxomycetes of Eastern Iowa. 117 



5. Enteridium rozeanum, Wing-ate. Plate I., Figs, i, la 



and lb. 



-^thalium, irregular, hemispherical, two to five centimeters 

 broad, brown, covered at maturity with a thin transparent 

 shining cortex, which blends below with the expanded hypo- 

 thallus. The united walls of the peridia forming a translu- 

 cent net, by reason of the numerous perforations or openings 

 between the several sporangia. Spores .008, brown, devel- 

 oped in clusters, hence exhibiting a varied surface as in 

 Reticiilaria. Sculpture, when examined under high magnifi- 

 cation, net-like, over about two-thirds of the surface. 



One of the largest and most conspicuous species of the 

 group. Specimens are also from year to year quite common, 

 very pretty, shining and trim, as they rest upon their substratum 

 of rotten wood. Later in the season when the spores have all 

 been blown away, the papery white cortex remains in shreds 

 behind, covering the residua of the ragged peridia. When 

 highly magnified (1000-1400 diameters) the spores exhibit an 

 elegant net-like reticulation spread over the larger part of the 

 surface. In several particulars, external appearance, size and 

 markings of the spores, this species resembles Reticularia 

 lycoferdon with which it is generally confused. The capilli- 

 tium, however, instantly distinguishes the two, and in the 

 present form the spore-sculpture is more delicate. 



CLATHROPTYCHIUM, Rostafinski. 



Sporangia, sessile, cylindric or prismatic, close-packed in a 

 single stratum, forming a flat disk-like ^thalium one or two 

 centimeters broad. The peridium at maturity vanishing except 

 the polygonal dome-like apex which is attached by a few sim- 

 ple filaments descending from the angles to the hypothallus. 



6. Ci>ATHROPTYCHiuM RUGULOsuM, Wiillroih. Plate I, Figs. 



2, 2a and 2b. 



Hypothallus strongly developed, usually extending beyond 



