THE MYXOMYCETES OF PICTOU COUNTY. — MOORE. 193 



Family, CPJBIIAIIIE.E. 



Fnictilieatioii> of distinct sporangia. The pevidinin be- 

 comes locally tliickciied and at maturity the tinmodilied parts 

 fall away, leaving the thickened portions in t»he 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 collecl^ions by four species, 

 three of which belong to the genus C'ribraria and one to tflie 

 genus Dictydium. 



Genus, Cribraria (Pers) Schrader. 

 Spui'angia distinct, stipitale. The tliickenings of the 

 peridium take the form of a delicate persistent net of band- 

 like filaments with thickenings at the nodes. The lower part 

 of tilie peridium generally persists in toto to form the so-called 

 calyculus, strengthened by radiating ribs marked by dark plas- 

 modic granules. 



22. Crihmria airiiVacca Persoon. — Sporangia umber brown, 

 ciowdel, npherical, stipitate. about .-")""" in diameter. Stip<^ 

 brown, stnut, short, abotit .:]'"'" long. Peridium persistent and 

 ir the Inwer })art marked l)y thickenings in the form of broad, 

 <'tark l)rown. radiating l)ands with numerotis plasmodic granules; 

 above this the bands become narrower and anastomose, but do 

 not pre-ent thickenings at the nodes ; on the top of the sporangia 

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

 ings at the nodes, and the net becomes more typically cril)raria 

 like. Spores light brown in mass, j^ale by transmitted light, 

 distinctly warted, about 0.5 ju. in diameter. 



On decaying Ahies halsamca. Rare. The largest fruc- 

 tification which T have seen covers an area .") x T)"'™. 



2;]. Cnhraria iiKirrorarpa Schrader. — Spoi^angia gregarious, 

 spherical, sti])itate, nodding, umber brown or yellowish bro^^^l 

 in color, about .7™'" in diameter. Stijie :d>out 1.5""" long, .OS'""' 



