MYGETOZOA 



(MYXOMYCETES) 



Subclass I. EXOSPOREAE 

 Spores developed outside of sporophores. 



Family I. CERATIOMYXACEAE 



Sporophores membranous, branched; spores white, borne 

 singly on filiform stalks arising from the areolate sporophores. 



A SINGLE GENUS. 



Genus 1. CERATIOMYXA Schroeter, in Engler & Prantl, 

 Nat. Pflanzenfam. 1 (i) : 16. 1889. 



Sporophores consisting of flattened, membranous tubes, either 

 branching from a common base or forking repeatedly, or forming 

 a network; the surface mapped out into polyhedral areolae, from 

 the center of each of which arises a slender stalk bearing a single, 

 ellipsoid, colorless spore. 



A SINGLE SPECIES. 



1. Ceratiomyxa fruticulosa (Mull.) Macbr. N. A. Slime-Moulds 

 18. 1899. 



Byssus fruticulosa Miill. Fl. Dan. Ic. 4 (12): 6. pi. 718. 1777. 



Plasmodium colorless or tinted. Sporophores white, occa- 

 sionally pinkish or yellowish, rarely with other tints, forming tufts 

 of simple or forked, fasciculate branches 1 mm. or more high, 0.07 

 mm. thick, or consisting of more or less anastomosing broad bands 

 from which arise irregular lobes. Spores white, smooth, usually 

 ellipsoid or ovoid, 10 X 6 to 13 X 7 /x- (Plate 16, fig. 16.) 



Var. flexuosa Lister, Mycetozoa 26. 1894. 



Ceratium arbuscula Berk. & Br. Jour. Linn. Soc. 14: 97. 1873. 



Ceratium filiforme Berk. & Br. Jour. Linn. Soc. 14: 97. 1873. 



Sporophores long, slender, white, profusely branching but not 

 anastomosing, 2 to 5 mm. high. 



Var. porioides (Alb. & Schw.) Lister, Mycetozoa 26. 1894, 

 Ceratium porioides Alb. & Schw. Consp. Fung. 359. 1805. 



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