Pleosporales » Trematosphaeriaceae » Trematosphaeria

Hadrospora fallax

Hadrospora fallax (Mouton) Boise

Trematosphaeria fallax Mouton, Bull. Soc. R. Bot. Belg. 25: 155 (1886)

Index Fungorum number: IF 135663 Faces of Fungi number: FoF00286


Saprobic on woody hosts. Sexual morph: Ascomata 300–365µm high, 300–410µm diameter, numerous, scattered to clustered, immersed to erumpent, globose, covered with sparse brown septate hyphae on lower part of ascoma. Beak 65–100µm long, 100–140µm wide, central, short-papillate, composed of polygonal to subglobose brown cells, with hyaline sparse periphyses. Ascomal wall mainly of textura globosa and partly of textura intricata in surface view; in longitudinal section 30–45µm thick at sides, composed of two wall zones, outer zone of compressed small dark brown pseudoparenchymatic cells, inner zone of 5–7 layers of polygonal hyaline to brown 7–25 × 3.5–10µm cells; slightly thinner at the base, 22–30µm thick. Pseudoparaphyses cellular, numerous, 2–4µm thick, septate, branched. Asci (130–)140–212.5 × 45–77.5(–87.5) µm (mean = 174.0 × 59.4µm, n = 28), bitunicate, not numerous, basal, ovoid to ellipsoid, rounded at the apex, apical chamber present, with a short stalk or somewhat sessile, with 8 overlapping triseriate to tetraseriate ascospores. Ascospores (63.5–)70–100(–104.5) × (17.5–)19–26(–29)µm (mean = 84.9 × 22.7µm, n = 139), L/W 3.3–4.2 (mean 3.8, n 125), broadly fusiform with rounded ends, straight to slightly curved, moderately thick-walled, 8–10-septate (septa of upper hemisphere the primary septum + septa of lower hemisphere = 3+1+4, 3+1+5, 4+1+4, 4+1+5), with the primary septum supramedian (0.41– 0.47, mean = 0.44, n = 125), constricted at the primary septum, weak to no constriction at other septa, the fourth or fifth cell from the apex (above the primary septum) enlarged downward, brown to reddish-brown and end cells pale brown, with or without guttules, smooth (but echinulate in lactophenol), with a conspicuous sharply delimited sheath, up to 34µm thick at sides, 10–15µm thick at both ends, sometimes constricted at the primary septum, and bell-shaped at ends. Ascospores produce 4–6 germ tubes from each end cell (Descriptions from Tanaka and Harada, 2003)


Material examined: JAPAN: On stems of unknown plants: Oowasawa River, riverbank (Chitose bridge), Kadoke, Hirosaki, Aomori, 140°30.532' E, 40°34.276' N, July 29, 2001, KT.613 (HHUF 27426, culture 4288); Oowasawa River, riverbank (Horikoshi bridge), Kadoke, Hirosaki, Aomori, 140°31.181' E, 40°34.304' N, Aug. 14, 2001, KT.672 (HHUF 27428, culture 4290); Toyohira River, riverbank, Sapporo, Hokkaido, 141°21.489' E, 43°02.229' N, Sept. 2, 2001, KT.765 (HHUF 27429, culture 4291). On stems of unknown herbaceous plants: Oowasawa River, riverbank (Chitose bridge), Kadoke, Hirosaki, Aomori, Aug. 4, 2001, KT.630 (HHUF 27427, culture 4289); Oowasawa River, riverbank (Nakachitose bridge), Shimizumori, Hirosaki, Aomori, 140°30.163' E, 40°34.181' N, Oct. 28, 2001, KT.817 (HHUF 27430, culture 4292). On twigs of an unknown woody plant: Hirakawa, riverbank (Hirosakioohashi), Hiraka, Minamitsugaru, Aomori, 140°32.030' E, 40°34.005' N, Aug. 5, 2001, KT.855 (HHUF 27431). On culms of Phragmites japonica Steud.: Hirakawa, riverbank (Shintaihoubashi), Hiraka, Minamitsugaru, Aomori, 140°31' E, 40°36' N, Oct. 13, 2002, KT.912 (HHUF 27669); Magarikawa, riverbank, Sakekawa, Mogami, Yamagata, 140°11' E, 38°48' N, Oct. 13, 2002, Y. Ooki & YH (HHUF 27670). All specimens and isolates are maintained at Herbarium Hirosaki University, Fungi (HHUF).


Freshwater distribution: China (Luo et al. 2004)