26 EXOSPOREAE [CERATIOMYXA 



Fam. & Wor. in Mem. Acad. Imp. Petersb., ser. 7, xx. 4 

 (1873) ; Zopf Pilzthiere, 69 & 174 ; de Bary Comp. 

 Morph. Fungi, 432 ; Cooke Brit. Fungi, ii. 550. C. pyxidatum 

 Alb. & Schw. Consp. Fung., 359. Ceratiomyxa mucida 

 Schroet. in Engl. & Prantl Nat. Pflanz., I. i. 16 (1889); 

 Lister Mycetozoa, 25 (1894). 



Var. 1. — flexuosa Lister : sporophores elongated, slender, 

 white, profusely branching but not anastomosing, 2 to 5 mm. 

 high. — Ceratium arbuscula Berk. & Br. in Journ. Linn. Soc, 

 xiv. 97 (1873). C. filiforme Berk. & Br. I.e. 



Var. 2. — porioides Lister : sporophores densely compacted 

 to form a honeycomb-like growth, superficially resembling 

 Polyporus vulgaris Fr., though more minute. Ceratium 

 porioides Alb. & Schw. I.e. Ceratiomyxa porioides Schroet. 

 I.e. ; Macbr. I.e., 19. 



PI. 1. — a. Sporophores of typical form (England) ; b. sporophores of var. rlexuosa 

 (Ceylon) ; c. sporophores of var. porioides (Iowa) ; d. clavate end of sporophore ; 

 all the spores but five have fallen from their stalks ; e. spore. 



Intermediate forms connecting the two varieties with the type are 

 of frequent occurrence. The plasmodium is sometimes yellowish-pink 

 in colour. 



Hab. On rotten wood ; common and widely distributed. — Lyme 

 Regis (B.M. 1166); Borneo (B.M. 1167); Iowa (B.M. 1169): var. 

 flexuosa — Ceylon (B.M. 1578) ; Brisbane ( B.M. 1579) ; Japan (B.M. 

 2301): var. porioides— Upsala (B.M. 1168); Iowa (B.M. 1025). 



Subclass II.— ENDOSPOREAE. 

 Spores developed within sporangia. 



Cohort I.—AMAUROSPORALES. 



Capillitium present. Spores violet-brown or purplish-grey 

 (ferruginous in Stemonitis ferruginea and S. flavogenita, 

 colourless in Echinostelium). 



Subcohort l.—CALCARINEAE. 



Deposits of lime either (a) in minute granules included in 

 the sporangium-wall, in expansions of the capillitium or in the 

 stalk; or (b) in the form of stellate or lenticular crystals 

 scattered over the sporangium-wall. 



Order I. — Physaraceae. 



Deposits of lime in minute round granules more or less 

 aggregated, included in the sporangium-wall and in vesicular 

 expansions of the capillitium (=lime-knots), except in Diderma, 

 Colloderma and Physarina where there are no lime-knots, and 

 in Diachaea, in which the lime is confined to the stalk and 

 columella and is sometimes in the form of rounded nodules. 



