Pycnopeziza quisquiliaris (Ellis & Everh.) W.L. White & Whetzel, Mycologia

Sánchez, Romina M. & Bianchinotti, M. Virginia, 2023, New records of mitosporic ascomycetes on Nothofagaceae from Patagonia, Argentina, Boletin de la Sociedad Argentina de Botanica 58 (4), pp. 491-503 : 498

6. Pycnopeziza quisquiliaris (Ellis & Everh.) W.L. White & Whetzel, Mycologia 30: 192. 1938. Fig. 2 O-R.

Conidiomata pycnidial, subperidermic, globose to obpiriform, dark brown when wet, black when dried, 180-225 × 100-188 µm (M = 193 × 138); ostiolum star-shaped. Conidiophores cylindrical, subhyaline to pale brown, ca. 5-10 × 3 µm. Conidiogenous hyphae cylindrical, holothallic, discrete, determinate, smooth-walled, subhyaline to pale brown, ca. 10-26 × 3 µm (M = 14.4 × 3). Conidia cylindrical with rounded ends, sometimes curved, centrally 1-septate, constricted, guttulate, hyaline, 11-17 × 2-4 µm (M = 14 × 3; n = 34), forming chains of up to 3 conidia.

Distribution and habitat. Growing on decorticated branches of Nothofagus antarctica in Argentina , on buds of Acer rubrum L. and on buds, leaves and petioles of an undetermined herbaceous species, both from the USA ( White & Whetzel, 1938).

Comments. Pycnopeziza quisquilaris is the only species in the genus with conidia deprived of appendages. The patagonian material agrees well with the originally described, which differs for its bigger conidiomata (400-1000 µm diameter) and longer chains of up to 16-20 conidia ( White & Whetzel, 1938).

Material examined. ARGENTINA. Chubut: Parque Nacional Los Alerces, on the way to Huemules forest , (42° 47’ 27.769’’ S, 71° 28’ 15.466’’ W), 1137 m alt., 28-X-2006, on decorticated branches of N. antarctica, Bianchinotti and Sánchez 335 ( BBB) .

Figures

Fig. 2. Dwiroopa ramya. A: Stromatic conidioma on decorticated wood. B: Two microconidia surrounded by macroconidia. C: View of the longitudinal germ slits of macroconidia. D: Conidium germinating through the longitudinal slit. Gilmaniella multiporosa. E: Sporodochial conidioma on substrate. F: Conidiophore. G: Conidiogenous cell. H: Conidia in chains. I: Terminal conidia showing multiple scars. Monodictys paradoxa. J: Conidioma on substrate. K: Conidium detached from the conidiogenous cell which narrows towards the apex. L: Conidium showing the lighter basal cells and a rest of the conidiogenous cell. M: Germinating conidium and formation of a new one. N: Different shapes and sizes of conidia. Pycnopeziza quisquiliaris. O: Vertical section of a conidioma. P: Chain of two conidia (phloxine stain). Q: Conidia attached to conidiogenous cells (phloxine stain). R: Conidiophore.Abbreviations= cg: conidiogenous cell; cp: conidiophore; mc: microconidia; s: scars; sl: germ slits. Scale bars= A: 1 mm; B–I, L–N, P: 15 µm; K, Q–R: 10 µm; O: 50 µm.