MYXOMYCETES. 



35 



35. 



Didymiuxn daedaleum. B. $ Br. 



Sporangia connate, sinuated, forming a drcdalioid mass of the 

 same colour as the stem, but sprinkled with white meal ; sterns 

 reddish-brown, inclining to orange, connate, as if composed of a 

 mass of little flat membranes ; capillitium white, very variable in 

 width, being in parts broad, flat, and membraneous ; spores violet- 

 black, globose, smooth. B. $ Br. Ann. Nat. Hist., No, 385 ; Cooke 

 Hdbk., No. 1131. 



In a cucumber frame. 



36. 



XHdymium pertusum. J>, ,0 Br. 



Scattered. Sporangia white, mealy, depresso-globose, deeply but 

 narrowly umbilicate ; stem attenuated upwards, rufous ; columella 

 central, white ; capillitium brownish ; spores nearly black. Berk. 

 Eng. Fl. v. p. 313 ; Cooke Hdbk., No. 1125. 



On dead herbaceous stems. 



\_~Didymium Sowerbeii, Berk. Eng. Fl., v., 313 ; Sow. t. 412, f. 3 ; 

 Cooke Handbk., No. 1128, is so imperfectly known that it is not 

 included here.] 



DIDTMIUM. 



A. Wall single or double ; columella entirely 



wanting ; plasmodiocarpia. 



Plasmodiocarp with double wall ; ca- 

 pillitium with coloured cells 



Plasmodiocarp with single wall ; ca- 

 pillitium relatively permanent, with 

 large coloured cells 



B. Wall single or double; columella developed 



in the typical forms ; sporangia usually 

 simple, rarely plasmodiocarpia. 

 I. Usually with columella, but when absent 

 the stem at least black or brown-black. 



f Without columella 

 |f With columella. 



* One columella common to many 

 sporangia 



dubium. 



COMPLANATUM. 



CLAVUS. 



PHYSARIOIDES. 



Each sporangium provided with 

 a separate columella. 



Columella hemispherical, many 

 celled ; cells filled with small 

 grains, or lumps of lime 



Columella globose, many celled ; 

 cells filled with small crys- 

 tals of lime 



FARINACEUM. 



MICROCARPON. 



