1897] ZYGOMYCETES, SYNCEPHALASTRUM AND SYNCEPHALIS 13 
EXPLANATION OF PLATES I AND II. 
The figures are reproduced by photolithography from camera drawings 
made with the combinations of Zeiss and Leitz objectives noted, and reduced 
about one-fourth in the reproduction. 
Syncephalastrum racemosum Cohn. 
. 1, Young sporangium in which the contents has separated into 
seven masses separated by intersporal substance. The spore walls have not 
yet formed. One of the spores is lateral in position. ~jy. oc. 4. 
FiG. 2. Sporangium containing mature spores, some of which have 
escaped from the base. Two lie free within the sporangium ; those near the 
ane oo side by side in the same position in which they were 
formed. +5. oc. 4. 
F1G. 3. ional sporangium containing single row of whe sit canine mature 
spores. +5. oc. 4. 
Fic. 4. Mature sporangium crushed, from which the spores are escaping. 
ES 
ts. OC. 4 
Syncephalis (Microcephalis) Wynnee Thaxter. 
Fic. 5. General habit of fertile hypha showing head on which the spores 
are still zz sztu. C.o 
Fig. 6. A similar en hypha in which the <cieae have separated and 
adhere in a viscous mass. C. oc. 2. 
Fic. 7. Tip of fertile hypha showing secondary sporophores from which 
numerous sporangial filaments are in process of development. J. oc. 2. 
Fic. 8. Tip of mature fertile hypha showing sitenge vt dh rae from 
which the spores have fallen. Seen in optical section. D. oc. 4. 
FiG. 9. Secondary sphorophore bearing immature ae filaments. 
Jj. 0c. 
Fic. 10. A similar sporophore in which the spores are nearly mature. 
Dees 4, 
Fic. 11. Sporangial filament with its two spores nearly mature. J. oc. 4 
F1G. 12. Two mature spores. J. oc. 4. 
Syncephalis reflexa Van Tieghem. 
Fic. 13. Fertile hypha with the spores mature. C. oc. 4. 
Fic. 14. The same, showing young sporangial filaments. C. oc. 4. 
Fic. 15. Zygospore with sterile outgrowths from conjugating hyphe 
Jj, 00.8 
Fic. 16. The same. A zygospore seen in optical section. J. oc. 2. 
