THE MYXOMYCETES OF P1CTOU COUNTY. MOORE. 193 



Family, CEIBEAKIEJE. 



Fructifications of distinct sporangia. The peridium be- 

 comes locally thickened and at maturity the unmodified parts 

 fall away, leaving the thickened portions in the form of a 

 closed net of flat bands or plates. The plasmodia live in decay- 

 ing wood and issue from this for fructification in the form of 

 small, slimy lumps, each of which gives rise to a sporangium. 



The family is represented in my collections by four species, 

 three of which belong to the genus Oibraria and one to 1ihe 

 genus Dictydium. 



Genus,, Cribraria (Pers) Schrader. 



Sporangia distinct, stipitate. The thickenings of the 

 peridium take the form of a delicate persistent net of ban&- 

 like filaments with thickenings at the nodes. The lower part 

 of Ijhe peridium generally persists in toto to form the so-<?alled 

 calyculus, .strengthened by radiating ribs marked by dark plas- 

 modic granules. 



22. Cribraria argillacea Persoon. Sporangia umber brown, 

 crowded, spherical, stipitate,, about .5 mm in diameter. Stipe 

 brown, stout, short, about .3 mm long. Peridium persistent and 

 in the lower part marked by thickenings in the form of broad, 

 dark brown, radiating bands with numerous plasmodic granules ; 

 above this the bands become narrower and anastomose, but do 

 not present thickenings at the nodes ; on the top of the sporangia 

 there is observable, here and there, a tendency to form thicken- 

 ings at the nodes, and the net becomes more typically cribraria 

 like. Spores light brown in mass, pale by transmitted light, 

 distinctly warted, about 6. 5 /A in diameter. 



On decaying Abies balsamea. Rare. The largest fruc- 

 tification whicn. I have seen covers an area 5 x 5 mm . 



23. Cribraria macrocarpa Schrader. Sporangia gregarious, 

 spherical, stipitate, nodding, umber brown or yellowish brown 

 in color, about .Y mm in diameter. Stipe about 1.5 mm long, .08 mm 



