Abstract
The morphology and ultrastructure of a Penicillium sp. grown on n-hexadecane or on peptone in shake-culture were compared using transmission and scanning electron microscopy. The fungus grew as hollow mycelial balls surrounding individual hydrocarbon droplets on n-hexadecane and as solid mycelial balls on peptone. A dense layer of fungal mycelium that showed irregular forms, fusion, and increase in hyphal size formed at the hydrocarbon-water interface. Inclusions were present in the hexadecane-grown fungus that were absent when the Penicillium sp. was grown on peptone. Problems of fixation made it difficult to differentiate detailed changes in the cytoplasm when the fungus was examined with the transmission electron microscope.
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