22 A Monograph of the Myxogastres. 



MYCETOZOA. 



I i 



Swarm-cells coalescing to Swarm-cells becoming 



form a plasmodium. aggregated, but not 



= MYXOMYCETES. coalescing to form a 



plasmodium. 

 ACRASIEAB. 



Cienkowski's Nuclcariae and Vampyrellae along with such 

 genera as Bursella, Protomyxa, Myxastrum, Manas, Monadop.us, 

 Pseudospora, Colpodella, and Plasmodiophora are considered by 

 De Bary as " doubtful Mycetozoa " for the following reasons. " I 

 here exclude from the ranks of the true Mycetozoa a few forms 

 or groups of forms, some of which have been occasionally 

 mentioned in the preceding sections. Those forms, so far as 

 they are known, have many points of resemblance with the 

 Mycetozoa, but either our knowledge of them is imperfect, or 

 else they depart so far in certain points from the typical 

 Myxomycetes and Acrasieae, that it is better to leave their 

 position in the system for the present undetermined." l 



Although De Bary clearly indicated that the existing classifi- 

 cation of the Mycetozoa was very imperfect, being the outcome 

 of pocket-lens observations on mature forms, and as above 

 indicated, pointed out a scheme in accordance with the modern 

 system of research, yet, lacking time, he never completed all 

 the details necessary for a thorough revision of the group. This 

 was done however by Dr. Rostafinski, a student of De Bary's, 

 and as at least some of Rostafinski's important work on this 

 subject was done by Rostafinski in De Bary's laboratory at 

 Strassburg, we may presume that the general scheme was more 

 or less inspired by De Bary. 



Rostafinski confined his attention to the group Myxomycetes 

 as defined by De Bary, and this group he calls Mycetozoa, thus 

 using the same name in a narrower sense than De Bary, who 

 included the Acrasieae that do not form a plasmodium, and in 

 his Monograph 2 recognized two primary divisions EXOSPOIIEAH, 



1 fiiinji Mycetozoa u>ul Bacteria, Engl. ed., p. 446. 



2 Monyrajia tilvzoivce, Paris, 1875 (in PolUh). 



