(M.B. Ellis) Uchida & Aragaki (1979) Macroscopic morphology Colonies on potato dextrose agar at 25°C are initially white, soon becoming dark gray to black with a black reverse. Rapid growth. Texture is woolly to cottony. Microscopic morphology Hyphae are septate and dark. Conidiophores may be up to 120 µm in length, are sympodial, geniculate, simple or branched, bearing conidia through pores or openings (poroconidia). Conidia measure 12-37 x 5-11 µm and have predominately 5-distosepta or pseudosepta (septa that do not extend to the cell wall with cells enclosed within sacs) and 6 cells. Conidia germinate from both poles. Special notes […]

(M.B. Ellis) Tsuda & Ueyama (1981) Macroscopic morphology Colonies on potato dextrose agar at 25°C are initially white, soon becoming gray to black with a black reverse. Rapid growth. Texture is woolly to cottony. Microscopic morphology Hyphae are septate and dark. Conidiophores may be up to 150 µm in length, are sympodial, geniculate, simple or branched, bearing conidia through pores or openings (poroconidia). Conidia have 2 to 5 transverse distosepta or pseudosepta (septa that do not extend to the cell wall with cells inclosed within sacs) and 3 to 6 cells. They measure approximately 14-40 x 6-11 µm. A flattened […]

(described by Vuillemin in 1912) Taxonomic Classification Kingdom: Fungi Phylum: Ascomycota Class: Euascomycetes Order: Clavicipitales Genus: Beauveria Description and Natural Habitats This hyaline, filamentous fungus first recognized as the etiologic agent of the devastating muscardine disease of the silkworm, is ubiquitous in plant debris and soil. Beauveria is also isolated from foodstuff, infected insects, and indoor air environment. Species The genus Beauveria contains several species. The most common ones are Beauveria bassiana and Beauveria alba. Pathogenicity and Clinical Significance Beauveria bassiana is a very rare human pathogen. It may be associated with keratitis. Pneumonia in an immunocompromised patient due to […]

(Vuillemin) Tiraboschi, 1926 Macroscopic morphology Colonies on potato dextrose agar at 25°C are variously colored (versicolored) and may range from very pale green, to greenish-beige, pinkish-green, salmon green, or dark green. Reverse is reddish to uncolored. Exudate, when present, is pink to reddish-brown. The growth rate is slow to moderate. Microscopic morphology Hyphae are septate and hyaline. Conidial heads are biseriate and loosely radiate. Conidiophores measure 120-700 µm in length, are hyaline to pale brown, smooth-walled and brittle (can see where many have “snapped off”). Vesicles are small (approximately 9-16 µm in diameter) and variably shaped, with metulae and phialides […]

(Bainer) Thom & Church (1926) Macroscopic morphology Colonies on potato dextrose agar at 25°C are white to yellow to drab gray to brown, but never green. Gray is the most common color. Reverse yellow to brown with a yellow diffusing pigment. Exudate, when present, is clear to yellow to purplish-brown. Rapid growth. Texture is woolly to cottony to somewhat granular. Microscopic morphology Hyphae are septate and hyaline. Conidial heads are radiate to loosely columnar and biseriate. Conidiophores 30-350 µm, smooth-walled, and brown. Vesicles are globose to subglobose, 7-16 µm in diameter. Metulae and phialides cover the upper portion of the […]

Thom, 1918 Macroscopic morphology Colonies on potato dextrose agar at 25°C are beige to buff to cinnamon. Reverse is yellow and yellow soluble pigments are frequently present. Moderate to rapid growth rate. Colonies become finely granular with conidial production. Microscopic morphology Hyphae are septate and hyaline. Conidial heads are biseriate (containing metula that support phialides) and columnar (conidia form in long columns from the upper portion of the vesicle). Conidiophores are smooth-walled and hyaline, 70 to 300µm long, terminating in mostly globose vesicles. Conidia are small (2-2.5 µm), globose, and smooth. Globose, sessile, hyaline accessory conidia (2-6 µm) frequently produced […]

Van Tieghem, 1867 Macroscopic morphology Colonies on potato dextrose agar at 25°C are initially white, quickly becoming black with conidial production. Reverse is pale yellow and growth may produce radial fissures in the agar. Microscopic morphology Hyphae are septate and hyaline. Conidial heads are radiate initially, splitting into columns at maturity. The species is biseriate (vesicles produces sterile cells known as metulae that support the conidiogenous phialides). Conidiophores are long (400-3000 µm), smooth, and hyaline, becoming darker at the apex and terminating in a globose vesicle (30-75 µm in diameter). Metulae and phialides cover the entire vesicle. Conidia are brown […]

Raper & Thom, 1944 Macroscopic morphology Colonies on potato dextrose agar at 25°C are buff to ochraceous to dull brown, plane or irregularly furrowed, mostly floccose, uneven in texture, and often have a granular appearance due to the production of small aggregates of Hülle cells which may initially resemble sclerotia. The reverse is dark yellow to reddish brown, and a faint mushroom odor may be present. Growth rate is moderate to rapid. Conidial heads are pale blue-green, however their production in some strains may be so minimal that this color pigmentation may not be evident. Microscopic morphology Hyphae are septate […]

Link, 1809 Macroscopic morphology Colonies on potato dextrose agar at 25°C are grayish-turquoise to deep green with yellow central areas due to cleistothecial production. Reverse is pale yellow to pale brown. Microscopic morphology Hyphae are septate and hyaline. Conidial heads are radiate to loosely columnar. Conidiophores are 200-350 µm in length, are smooth walled and uncolored to pale brown. Vesicles are globose to subglobose, 15-30 µm in diameter, and are uniseriate. Phialides cover the upper portion of the vesicle. Conidia are globose to subglobose, finely roughened to echinulate, and measure 3.5-6.5 µm in diameter. Cleistothecia are yellow, thin-walled, globose, measure […]

Fresenius, 1863 Macroscopic morphology Colonies on potato dextrose agar at 25°C are smoky gray-green with a slight yellow reverse. Some isolates may display a lavender diffusible pigment. Very mature colonies turn slate gray. Rapid growth. Texture is woolly to cottony to somewhat granular [1875], [1215]. Atypical isolates may remain white with little conidiation [2202], [531]. Microscopic morphology Hyphae are septate and hyaline. Conidial heads are strongly columnar in an undisturbed culture. Conidiophores are smooth-walled, uncolored, up to 300 µm long, and terminate in a dome-shaped vesicle that is 20- 30 µm in diameter. This species is uniseriate with closely compacted […]

Link ex Gray, 1821 Macroscopic morphology Colonies on potato dextrose agar at 25°C are olive to lime green with a cream reverse. Rapid growth. Texture is woolly to cottony to somewhat granular. Sclerotia, when present, are dark brown. A clear to pale brown exudate may be present in some isolates. [1875], [1215], [2202], [531]. Microscopic morphology Hyphae are septate and hyaline. Conidial heads are radiate to loosely columnar with age. Conidiophores are coarsely roughened, uncolored, up to 800 µm long x 15 – 20 µm wide, vesicles globose to subglobose (20 – 45 µm), metulae (8 – 10 x 5 […]

(described by Cochet ex Sigler and Carmichael in 1976) Taxonomic Classification Kingdom: Fungi Phylum: Ascomycota Class: Euascomycetes Order: Eurotiales Family: Eremomycetaceae Genus: Arthrographis Description and Natural Habitats Arthrographis is a cosmopolitan filamentous fungus isolated from soil and compost. The genus Pithoascus is the teleomorphic genus associated with Arthrographis. Species Five species of Arthrographis have been described.

(described by Cochet ex Sigler and Carmichael in 1976) Macroscopic morphology Colonies on Sabouraud dextrose agar at 35°C represent the Trichosporiella yeast synanamorph of Arthrographis kalrae[2106]. These colonies are cream colored and glabrous and, may resemble those of Candida albicans. When grown on potato dextrose agar for 7 day at 25°C colonies are velvety with a white to buff front and a pale yellow reverse. Microscopic morphology The yeast phase consists of elongate to oval budding blastoconidia that are germ tube negative. The filamentous phase has hyaline, septate hyphae, dendritic (tree-like) conidiophores, and chains of rectangular arthroconidia 2-4 µm in […]