Acremonium species are usually slow growing and are initially compact and moist. Acremonium hyphae are fine and hyaline and produce mostly simple phialides.
Their conidia are usually one-celled (i.e. ameroconidia), hyaline or pigmented, globose to tube-shaped, and for the most part aggregated inwards slimy heads at the apex of each phialide.
The genus Acremonium includes some of the most simply structured of all filamentous anamorphic fungi. The characteristic morphology consists of septate hyphae giving rise to thin, tapered, mostly lateral phialides produced singly or in small groups. Conidia tend to be unicellular, produced in mucoid heads or unconnected chains. They can be hyaline or melanised, but the hyphae are usually hyaline.
Acremonium alcalophilum is the only known cellulolytic fungus that thrives in alkaline conditions that can be cultured readily in the laboratory. This fungus was isolated from sludge of pig manure compost. Its optimal conditions for growth are 30°C and pH 9.0-9.2. Examines on-duty bacteria and fungi that can tolerate a across-the-board pH cooking stove indicate that adaptation to high up pH conditions involves products that function in the extracellular neighborhood or at the cellular telephone boundary. Hence the genome sequence of A. alcalophilum is expected to provide a rich genetic resource for identifying extracellular enzymes with pH optima in the alkaline range.
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