Achaetomium globosum J. N. Rai & J. P. Tewari

Achaetomium globosum J. N. Rai & J. P. Tewari View in CoL , Canad. J. Bot. 42 (6): 693 (1964)

Fig. 17 View Figure 17

Description.

Sexual morph: On CMA medium, sporulation initiated after approximately 30 days of cultivation. Ascomata Spherical to subellipsoidal, initially grayish-yellow, turning brownish to black at maturity, ostiolate, attached to the medium surface by aerial hyphae or sometimes partially embedded in the medium, 80–286 μm diam., peridium composed of textura intricata (interwoven hyphae), brownish in color. Asci Not observed. Ascospores Spherical to ellipsoidal, brownish, extruded in droplet form from ascomata, aseptate, unicellular, measuring 9.7–13.1 × 8.8–11.0 µm (av. ± S. D. = 11.6 ± 0.9 × 9.8 ± 0.6) μm in size. Asexual morph: Not observed during this study.

Culture characteristics.

Cultured on PDA medium for 7 days at 25 ° C in the dark, the colony diameter can reach 60 mm. The aerial hyphae are flocculent, white at the initial stage and then turn light purple-pink. After 14 days, the colony color becomes purplish red and produces purple-pink pigments. It is not easy to sporulate on PDA medium. On CMA medium, the colony diameter reaches 60 mm after 7 days of culture. The colony is grayish yellow, and the aerial hyphae are light yellow. Sporulation begins on the surface of the medium after about 30 days of culture.

Specimens examined.

China • Beijing City, Changping District, Ming Tombs Reservoir , 40°14'48"N, 116°15'1"E, on the diseased scale leaves of Platycladus orientalis , 2 October 2024, Z. X. Bi, BJFC -S 2565 , living culture CFCC 72648 GoogleMaps .

Notes.

Achaetomium globosum was first isolated and described by Rai et al. (1964) from Tamarindus indica , with a subsequent record on Parthenium sp. ( Pande 2008). Comprehensive phylogenetic and morphological analyses identified the fungal strain CFCC 72648 as A. globosum .