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Introduction to Fungi, Third Edition

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THE ‘TRUE’ SMUT FUNGI (USTILAGINOMYCETES)<br />

641<br />

Fig 23.4 Teliospore germination in<br />

Ustilago nuda. (a) Three teliospores<br />

20 h after germination, showing<br />

various stages of development of<br />

the promycelium.The arrows<br />

indicate points where cell fusion<br />

has occurred. (b) A later stage<br />

showing the extension of<br />

mycelium from the fusion cells.<br />

(c) Two-day-old germinating<br />

teliospore showing repeated cell<br />

fusions (arrows).<br />

Fig 23.5 Teliospore germination in Ustilago<br />

filiformis. (a) Teliospore germination by successive<br />

development of sporidia. Note the absence of an<br />

extended promycelium.The first-formed sporidia<br />

are short. (b) Sporidium showing budding.<br />

(c) Sporidia conjugating. A dikaryotic mycelium<br />

arises following conjugation.

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