The Sarcodina 233 



posedly gametes which fuse in pairs to produce amoeboid zygotes. In a 

 number of other Eumycetozoina (40), one or two amoeboid "swarm-cells" 

 are liberated and each amoeba then develops a flagellum. In Physarum 

 polycephalum, for instance, the spore nucleus divides once at the begin- 

 ning of germination and fission produces two amoeboid stages. One 

 amoeba emerges, develops a flagellum, and then swims away. The second 

 amoeba then repeats the process (59). Syngamy of the myxoflagellates 

 produces amoeboid zygotes (60). Except perhaps for slight differences in 



C ,M 





Fig. 5. 23. Sporangia in various Eumycetozoina (after MacBride): A. An 

 aethallium of Fuligo septica, xO.75. B. A plasmodiocarp of Hcmitrichia 

 serpula, x2.2. C. Sessile sporangia of Trichia inconspiciia, xll. D. Physarum 

 leiicopus, xll. E. Didymiiirn annulatum, xl3.5. F. Trichia decipiens, x6 ap- 

 prox. G. Didymiiim melanosperrnum, x7.5. H. Section showing capillitium 

 in sporangium of Physarella oblonga, x24. I. Badhamia magna, \.l.b. 



vital staining, there is no evidence for two distinct types of "swarm-cells" 

 (69), and this question remains open for the suborder. Although meiosis 

 has been reported just before formation of the uninucleate "protospores" 

 in Ceratiomyxa (41), there is much uncertainty as to the exact stage in 

 which this process occurs in Eumycetozoina generally. 



The following genera have been included in the suborder: Arcyria Wiggers (74), 

 Amaurochaete Rostafinski, Badhairiia Berkeley, Ceratiomyxa Schroter (41), Cribraria 

 Persoon, Didymium Schriider, Fuligo Haller, Licea Schrader, Lycogala Adanson (153), 

 Margarita Lister, Orcadella Wingate, Physarum Persoon (59, 60), Reticularia Bulliard, 

 Stemonitis Gleditsch (7), Trichia Haller, Tubulina Persoon. 



Order 3. Amoebida 



The Amoebida normally form lobopodia in locomotion, or else 

 move by a wave-like protoplasmic flow. Some species form slender acces- 



