Parasitic chytrids
The chytrid Batrachochytrium dendrobatidis is seen in these light micrographs as transparent spheres growing on (a) a freshwater arthropod and (b) algae. This chytrid causes skin diseases in many species of amphibians, resulting in species decline and extinction.
Source
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"OpenStax College, Classifications of Fungi. October 17, 2013."
http://cnx.org/content/m44625/latest/Figure_24_02_01.jpg
OpenStax CNX
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