190] CELL AND NUCLEAR DIVISION IN FULIGO VARIANS 219 
of solid threads (Stereonemata) form the latter from strands 
of protoplasm. As a matter of fact, both forms of capil- 
litium may arise in vacuoles, as I have been able to determine in 
the cases of Stemonitis and Lycogala. The account given by 
Strasburger is correct, and I have not thought it necessary to 
give further figures at this time. Whether the thread is hollow 
or solid, simple or branched, free or connected with the peridium 
ora columella, are entirely secondary conditions, depending on 
the extent and form of the vacuoles. 
Massee neglects Strasburger’s account of capillitium forma- 
tion altogether, and advances the extremely loose and erroneous 
view that generally a surplus portion of the protoplasm takes 
the form of a more or less complicated network mixed with the 
pores, and homologous with the strands described as being 
Present in the sporangium of Mucor, inasmuch as both struc- 
= are made from a substance separated from the protoplasm 
during Spore formation. I have shown (4) that the so-called 
- “tsporal protoplasm of the Zygomycetes is merely excreted 
slime, and Strasburger’s account of capillitium formation is true 
ae all slime molds that have as yet been carefully investigated. 
Lister has discovered karyokinetic division of the nuclei in 
i. oF = considerable number of genera, and has 
“a a aryokinetic figures in the dividing swarm spores and 
© plasmodia, though he also figures direct division 
cell formats at this latter stage. He concludes that whenever 
Mucle; ay eer in the life history of the Mycetozoa, the 
de by karyokinesis. Lister also observed in certain 
Se a pe i-tasces containing six to ten nuclei in the” 
into a. ll and describes these masses as separating 
division, “Sig . during the succeeding stages of nuclear 
Sr acca = va Genera he confirms. the account of Stras- 
= SPore formation ¢ ss which nuclear division is complete before 
: B egins. 
formation ae, follows Strasburger in describing the spore 
€ whole group of slime molds as taking place 
: by simu] | 
: taneous breaking up of the protoplasm of the sporange 
