Order 3. Thamnidiaceæ. On the same sporangiophore, in addition to a large, terminal, many-spored sporangium, many smaller, lateral sporangia are formed with a few spores. Thamnidium.
B. Asexual reproduction by sporangia and conidia.
Order 4. Choanephoraceæ. Choanephora with creeping endophytic mycelium, and perpendicular sporangiophores.
Order 5. Mortierellaceæ. Mortierella polycephala produces on the same mycelium conidia and sporangiophores. M. rostafinskii has a long stalked sporangiophore, which is surrounded at its base by a covering of numerous felted hyphæ.
Fig. 83.—Pilobolus. Mycelium (a, a), with a sporangiophore (A) and the fundament of another (B).
Fig. 84.—Pilobolus. Sporangium (a″) with stalk (a-c), which is covered by many small drops of water pressed out by turgescence.
C. Asexual reproduction only by conidia.
Order 6. Chætocladiaceæ. The conidia are abstricted singly and acrogenously. Chætocladium is a parasite on the larger Mucoraceæ.