Introduction to Fungi, Third Edition

Plate12 Urediniomycetes (a g) and Ustilaginomycetes (h j). (a) Aeciospore of Puccinia distincta.Lipid droplets have been displayed
by the two nuclei in the upper spore. (b) Aecial infection of Pucciniacaricina on stinging nettle. (c) Uredinia (orange pustules) and telia
(dark purple lesions) of Phragmidiumviolaceum on theunderside of a leaf ofbramble. (d f)Gymnosporangiumfuscum. (d) Telial horns on
aswollencankeronJuniperus in spring. (e) Spermogonial infection on a pear leaf in midsummer. (f) Roestelioid aecia on the underside
of a pear leaf in autumn.The aecial caps are connected to the aecialbase by trellis-like threads. (g) Uredinia of Melampsora sp. on
Populus tremula. (h) Maize smutcausedby Ustilago maydis. Swollen kernels have become convertedinto teliospore-bearing tumours.
(i) Exobasidium sp. on an ornamental Azalea.Infectedleaves are strongly hypertrophied. (j) Systemic Exobasidiumvaccinii infection of
blueberry (Vaccinium myrtillus).The infected shoot (left) shows a reddish discolouration. (d) and (i) kindly providedby H.Weber.