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Examining colonial morphology is the first step in the identification of an unknown microbe. The systematic assessment of the colonies' appearance, focusing on aspects like size, shape, colour, opacity, and consistency, provides clues to the identity of the organism, allowing microbiologists to select appropriate tests to provide a definitive ...
Rhodotorula glutinis is an aerobic yeast characterized by pink, smooth colonies with a moist appearance. [2] Reproduction is typically by multipolar budding although pseudohyphae are occasionally produced. Sexual reproduction is by basidiospores arising from a teliospore developed from a mycelial clamp connection. [2]
Rhodotorula mucilaginosa cells, Methylene blue stain, magnification 400x. Rhodotorula is a genus of fungi in the class Microbotryomycetes.Most species are known in their yeast states which produce orange to red colonies when grown on Sabouraud's dextrose agar (SDA).
At 37 °C (99 °F) either in the laboratory or in host tissue, S. schenckii assumes its yeast form. Macroscopically, the yeast form grows as smooth white or off-white colonies. Microscopically, yeast cells are 2 to 6 μm long and show an elongated cigar-shaped morphology. [1]
Colonies of K. marxianus are cream to brown in colour with the occasional pink pigmentation due to production of the iron chelate pigment, pulcherrimin. [ 10 ] [ 11 ] When grown on Wickerham's Yeast-Mold (YM) agar, the yeast cells appear globose, ellipsoidal or cylindrical, 2–6 x 3–11 μm in size. [ 10 ]
The growth of yeast within food products is often seen on their surfaces, as in cheeses or meats, or by the fermentation of sugars in beverages, such as juices, and semiliquid products, such as syrups and jams. [123] The yeast of the genus Zygosaccharomyces have had a long history as spoilage yeasts within the food industry.
The colony surface is smooth and has a pasty texture. [1] [10] There is considerable cell and colony morphology when S. salmonicolor is grown in culture. [6] The budding yeast-like cells produced during the asexual stage are ellipsoidal to subcylindrical and 8–25 × 2–5.5 μm. They can occur singly or in pairs.
Malassezia pachydermatis is a bottle-shaped, [2] non-lipid dependent lipophilic yeast in the genus Malassezia. [5] Colonies are cream or yellowish in colour, smooth to wrinkled and convex with a margin possessing a slightly lobed appearance. [5] [8] Cells are ovoidal in shape and range in size from 3.0–6.5 x 2.5 μm. [5]