dichotomy of eight small sporangia, (iii) a secondary lateral dichotomy of 

 mouosporic sporaugioles. 



Pig. 20.— Monosporic sporaugioles with granular walls (x 250). 



Ch(Btostylum Fresenii. 



Fig. 21. — Lateral branch inserted, with numerous others, on the top • 

 of a hypha; it terminates in a point, and bears two false verticils of branch- 

 lets. Tlie lower sporaugioles are of the fourth, the upper of the third 

 order (x 250). 



Chcetocladium Jojiesii. 



Fig. 22. — Fruiting hypha terminating in a point, and bearing upon a 

 middle dilatation monosporic sporangia with granular walls and simple or 

 diciiotomous pedicels ( X 270). 



Fig. 23. — a, a monosporic sporangium, with a portion of its pedicel; b, 

 one ruptured by pressure, showing the inclosed sniool h spore ; c, c, spores 

 entirely freed from their sporangia ; d. a spore escaping from its sporangium 

 at the commencement of germination ( x 270). 



Figs. 24 — 27. — Successive stages of germination. 



Fig. 28. — Granular-walled balloon-like bodies terminating some of the 

 branches (x 270). 



Fig. 37. — Successive stages of fructification in cell-culture. 



Chcetocladium Brefeldii. 



Fig. 29. — Mycelium proceeding from a single spore after sixty-seven 

 hours ; the lateral processes are only figured on a single branch (/«). 



Fig. 30. — End of a principal branch after five and a half days : a lateral 

 process (c) has developed a sporangiferous branch (^), of which the aerial 

 portion is shaded ; it bears fertile branches {t and/), and also sterile ones, 

 at its base (x 190). 



Fig. 31. — Extremity of a hypha after four and a'lialf days' culture ; one of 

 its branches {a) is prolonged into an aerial filament, bearing laterally nu- 

 merous groups of ripe sporangia ( x 190). 



Fig. 32. — One of these groups of monosporic sporangia (x 400). 



Figs. 33, 34. — Lateral processes in contact with a hypha of Mucor 

 Mucedo{x 400). 



Fig. 35. — Three spores (s, *', s') which have germinated, and the hyphae of 

 which have fused (x 190). 



Fig. 36. — Two branches of a hypha which have fused, forming a loop 

 (X 190). 



