422 CONIDIAL FRUCTIFICATION OF CHOANEPHORA. 
extent, in an inverse relation to the sporangia. The description, too, of the different degrees ` 
of development of the filaments and dilatations bearing the aerial chlamydospores recalls 
very forcibly the phenomena occurring in the case of the unequivocally conidial frueti- ` 
fication of Choanephora. ; 
The above observations have not been made with any desire to detract from the value ` — 
of the brilliant series of observations recorded by MM. Van Tieghem and Le Monnier, 
but simply with a view to pointing out that the subject cannot yet be regarded as satis- 
factorily decided. It is not, of course, to be assumed that because one genus of Mucorini 
has been shown to possess both sporangial and conidial forms of fructification, all other 
genera must necessarily do so also. Still as one has been shown to do so, and as the 
production of the various forms of fructification has been shown to be closely connected 
with variations in the conditions of the nutrition of the plant, there are some grounds ` ` 
for suspecting that the phenomenon may not be an exceptional one, and there is cer- 
tainly reason for renewed investigation in order to determine the point. 
DESCRIPTION OF PLATE XLVII. 
Fig. 1. Mature conidial head of Choanephora. x 76. 
Fig. 2. Head after the fall of the conidia. x 180. 
Fig. 3. Immature capitellum with young conidia. x 800. 
Fig. 4. Capitellum after fall of conidia. x 800. 
Fig. 5. Diagram of the various types of conidial heads. 
Fig. 6. Mature conidium. x 960. 
Fig. 7. Conidium and young germinal tube. x 960. 
Fig. 8. Conidium and portion of young mycelium. x 960. 
9 
. Sporangial fructification. x 180. 
. Ruptured sporangium and mature spores. x 840. 
. Commencement of sexual process ; formation of club-shaped dilatations on 
the mycelium. x 360. 
Fig. 12. Conjugation of sexual cells; isolated sexual cell and empty dilatations. 
x 420. 
Fig. 13. Sexual cells in contact. x 840. 
Fig. 14. Mature sexual cell, showing arcuate form. x 480. 
Fig. 15. a, Conjugated cells ; 6, commencing growth of the zygospore; c, continued 
development of the zygospore; d, mature zygospore. x 180. 
Fig. 16. Ruptured zygospore, with escape of oil and granular protoplasm. x 180. 
Fig. 17. Chlamydospore. x 960. 
Fig. 18. Chlamydospores and mycelial filaments. x 180. 
Fig. 19. Origin of conidiiferous filaments. x 180. 
Fig. 20. Mycelial filaments. x 180. J 
ru 
&&i 
kel Lm 
TO 
