A new species of chaetomium in the rhizosphere of Vitis vinifera L

TLDR: Perithecia produced abundantly on Potato-Sucrose-Agar and and Czapek's-Dox- agar medium, broadly" ovoid to ellipsoidal, sometimes almost spherical when young, olivaceous in the early stages, dark brown and membraneous when old.

Abstract: Perithecia produced abundantly on Potato-Sucrose-Agar and and Czapek's-Dox-Agar medium, broadly\" ovoid to ellipsoidal, sometimes almost spherical when young, olivaceous in the early stages, dark brown and membraneous when old, measuring 166.6-215.6×127.4--156.8#, with a pointed base from which a few hyaline rhizoids are produced fixing the perithecium to the substratum (]Fig. A). The perithecia are ornamented with thick, straight, septate, flexuous lateral setae, relatively few in number, tapering to a hyaline point at the apex, brown or brownish-black in colour about 3 4 ~ in diameter. Terminal hairs sparsely septate, wavy, dark rich olive-brown, broader at the base, gradually diminishing in diameter towards the apex, slightly less coloured at the tips measuring 1,9--3.9~ in diameter (Fig. B). Asci oblong, hyaline, clavate, 17--28 × 4.9--9.8 ,u in diameter, evanescent, (Fig. C). Ascospores hyaline when young rich olive brown, smooth, one celled, broadly ovoid, faintly apiculate at both ends measuring 5.8--6.8 x 3.9--4.9 ~ ir~ diameter (]Fig. D). Habitat: Isolated from rhizosphere of Vitis vini/era L., Hyderabad, A.P., India. Type culture deposited at the Commonwealth Mycological Institute, Kew, Surrey, England, No: (112029).