Introduction to Fungi, Third Edition

EXAMPLES OF MUCORALES
187
Fig 7.19 Syzygites megalocarpus.
(a) Sporangiophore. (b) Germinating
zygospore.The fungus is homothallic.
Fig 7.20 Asexual reproduction in Pilobolus
kleinii. (a) Developing trophocyst which is
becoming distended by carotenoid-rich
cytoplasm. (b) Trophocyst with immature
sporangiophore.The clear tip of the
sporangiophore is light-sensitive.
(c) Trophocyst bearing a developing
sporangium.The upper part of the sporangium
is beginning to darken.Globules of liquid
accumulate on the sporangiophore surface
(9.00 p.m.). (d) Trophocyst with sporangium
which has not yet dehisced (9.00 a.m.).
The arrow (o) points to a carotenoid-rich band
of cytoplasm called the ocellus.
(e) Sporangiophore bearing a
sporangium which has dehisced near its base.
Spores have extruded and are held in place by
a ring of mucilage (11.30 a.m.). (f) Sporangium
showing dehiscence line at its base
(d). (g) Discharged sporangium surrounded
by dried-out vesicular sap.The spores are
enclosed in mucilage. (a e) to same scale;
(f,g) to same scale.