A Monograph of the Myxogastres. 23 



having the spores produced externally on slender sporophores, a 

 feature met with only in the genus Ceratium ; and ENDOSPCtoEAE, 

 having the spores produced in sporangia. In the second 

 " Appendix " to the Monograph, amongst other changes in the 

 classification, the EXOSPOREAE division is omitted altogether, 

 and the Endosporous division alone retained. In Rostafinski's 

 classification the two primary divisions are founded on the 

 colour of the spores as seen under the microscope by transmitted 

 light ; each primary division is further divided into two sections 

 determined by the presence or absence of a capillitium as 

 shown in the following arrangement 



MYCETOZOA. 



ENDOSPOREAE. 



AMAUROSPOREAE. LAMPROSPOREAE. 



Spores violet or brownish- Spores yellow or brownish, 



violet. never violet. 



ATRICHAE. TRICHOPHORAE. ATRICHAE. TRICHOPHORAE. 



Von Tieghen uses the name Myxow^cetes in a broader sense 

 than De Bary's Mycetozoa, and arranges the groups as follows: l 



MYXOMYCETES. 

 THALLUS. 



Unicellular. Plnricellular. 



without a plasmodium. 



= PLASMODIOPHOREAE. 



J 



Cells fusing to form 

 a plasmodium. 



cells aggregated but not fusing 



to form a plasmodium. 



= ACRASIEAE. 



Spores produced in Spores produced externally. 



a sporangium. =CERATIEAE. 



= ENDOMYXEAE. 



1 Traite de Botanique, p. 992 (1884). 



