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4. Dimorphic fungi may exhibit two different growth forms. Outside the body they grow as a mold, producing hyphae and asexual reproductive spores, but in the body they grow in a yeast-like form. 5. The appearance of a mold and the type of spores it produces is useful in its identification.. Dimorphic fungi. Dimorphic fungi may exhibit two different growth forms. Outside the body they grow as a mold, producing hyphae and asexual reproductive spores, but in the body they grow in a non-mycelial yeast form.
Histoplasma capsulatum. Histoplasma capsulatum is a good example of a thermally dimorphic fungus. This fungus grows in its yeast form at 37Â°C, but switches to mold form at 20-25Â°C. H. capsulatum is found throughout the world in substrates rich in nitrates such as bird droppings, chicken manure and bat guano.imorphism is common with some members of the major divisions of the fungal kingdom, i.e., Zygomycota, Ascomycota, Basidiomycota, and mitosporic fungi. Some dimorphic fungi will switch to yeast or mold form depending on the prevailing temperature.