Introduction to Fungi, Third Edition

EXAMPLES OF MUCORALES
199
Fig 7.31 (a) Mortierella zonata sporangiola, one germinating. (b,c) Mortierellarostafinskii (after Brefeld,1876). (b) Developing zygospore.
(c) Older zygospore surrounded by a weft of hyphae. (d) Mortierella epigama zygospore with unequal suspensors arising
from a common branch showing that this fungus is homothallic and heterogametangic.The zygospore proper, lying within the
zygosporangium, has a thick undulating wall.
appearing as two contiguous spheres (Figs.
7.32e,f). Eventually the macrogametangium
becomes a zygosporangium, its wall ornamented
with small warts, and containing a smooth,
thick-walled zygospore.
The heterothallic M. indohi is also heterogametangic,
one progametangium being blunter
and more rounded than the other. A cross wall
develops only in this larger progametangium to
cut off a gametangium which enlarges and