More striking is the effect of light on reproduction in fungi. Colonies exposed to diurnal periodicity exhibit alternating zones of sporulating and non-sporulating hyphae. The brown rot fungus, Monilia spp. (Fungi Anamorphici), forms concentric rings of spores on fruits and Phyllosticta (Fungi Anamorphici) and other fungi form rings of pycnidia on leaves. The zones of spores are usually stimulated by light but may actually form during the subsequent dark periods. A strain of the fungus Aspergillus ornatus (Ascomycotina) reproduces asexually under light and sexually under dark and was therefore nicknamed "the bashful fungus." These examples clearly show that fungi too respond to light and dark periods.
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