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Monosporascus Cannonballus An Unusual Ascomycete in Cantaloupe Roots

1974; Taylor & Francis; Volume: 66; Issue: 2 Linguagem: Inglês

10.1080/00275514.1974.12019610

1557-2536

Flora G. Pollack, F. A. Uecker,

Plant Pathogens and Resistance

Colonies grow rapidly, and a hyaline mycelium covers the agar in a petri dish in 3-5 da at 24, 28, 35, and 38 C. Some ascocarps are produced on Difco PDA, CMA, and LBA agars. Maximum production takes place on MY agar at 28-29 C in 1 mo. The MY agar consisted of 1% malt extract, 0.4% yeast extract, and 0.4% dextrose. Ascocarps are produced on full-strength and 4-strength medium. Perithecia produced in culture are similar to those produced in cantaloupe root tissue. In culture some perithecia are so small that they contain only one or two asci, while others reach 500 /% in diam. The perithecium is nearly globose, nlembranous, cream to light brown, with a well-defined dark periapical ring (FIG. 2). Within the ring, a short, rounded neck may protrude (FIGs. 3, 4). The several-layered perithecial wall (FIG. 3) is transparent, and the dark ascospores can be seen through the wall (FIG. 1). The inner wall layers are flattened plectenchyma. The more external layers are also plectenchymatous, with pigment irregularly distributed in the walls of the outermost layers. The perithecium ruptures by a tear within the dark periapical ring (FIG. 2). Asci (FIG. 5) are clavate to pyriform, stipitate, unitunicate, thick walled, persistent, 5690 x 30-55 /u including the stipe. Asci are released from the perithecium i , J. 1931. M nographia Pezizinearum Riograndensium. Broteria, Sir. Bot. 346