Leaf-inhabiting genera of the Gnomoniaceae, Diaporthales - CBS

So g o n o v e t a l.
Fig. 5. Morphology on natural substrates, perithecia. A, B. Gnomonia neognomon. A. BPI 877466A. B. BPI 877526C. C–H. G. orcispora. C, D. BPI 877526A. E–H. Holotype BPI
877465C. I–L. G. ostryae. I–K. BPI 611536. L. BPI 871051. A, C–F, I, J. Intact air-dry perithecia on leaves. B, H, K, L. Extracted and rehydrated perithecia. G. Semi-rehydrated
perithecium on a small fragment of a leaf. Scale 200 μm.
eccentrico Gnomoniae speciebus ascosporae magnitudine differt.
Holotypus: BPI 877499A.
Anamorph: Unknown.
Etymology: Named after Michel Monod, Lausanne, Switzerland,
in recognition of his contribution to the taxonomy of the
Gnomoniaceae.
Perithecia solitary, without stroma, hypophyllous, on leaf blade or
veins, in loose irregular groups, immersed at first, erumpent, black,
oblate or suboblate when moist, concave when dry, 180–220 µm
high × 270–310 µm diam. Necks eccentric, straight or slightly
curved, 320–420 µm long, 40–45 µm wide at base, 35–40 µm
wide at apex. Asci fusiform, (42.5–)45.5–46.5(–51) × 9–11(–13)
µm (mean = 46 × 10.5, SD 3, 1.5, n=6), apical ring 2–2.5 µm diam,
with eight ascospores arranged irregularly multiseriate. Ascospores
fusiform, straight or inequilateral (14–)15–16(–18.5) × (2–)2.5(–3)
µm (mean = 15.5 × 2.5, SD 1, 0.2, n=54), l:w (4.9–)5.7–6.4(–7.3)
(mean = 6, SD 0.6, n=54), two-celled, septum located at (53–)60–
64(–70) % (mean = 62, SD 4, n=54) of ascospore length, not or
slightly constricted at septum, ends blunt, rounded, each cell with
2(–3) large, some smaller, guttules; appendages absent or ovoid,
cuneiform or subulate to whip-shaped, to 20 µm long.
Habitat: On overwintered leaves of Corylus avellana (Betulaceae).
Distribution: Europe (Denmark, Switzerland).
Holotype: Switzerland, Valais, vicinity of Martigny, on overwintered
but still attached leaves, 21 May 2005, M. Monod & M.V. Sogonov
MS0335 (BPI 877499A).
Additional specimen examined: Denmark, Jylland, Krabbesholm Skov, on leaves of
Corylus avellana, 07 Apr. 1901, J. Lind (BPI 611819); Switzerland, Valais, La Tallaz,
vallon de Gueuroz, 05 Jun. 1979, M. Monod, No. 741 (LAU).
Notes: Two of the specimens here regarded as Gnomonia monodii
were identified as Apiognomonia ostryae by Monod (1983).
Gnomonia neognomon Sogonov, sp. nov. MycoBank MB 512254,
Figs 5A,B; 6A–C; 7A–O.
Perithecia 170–250 µm alta × 220–370 µm diam. Rostrum
400–1075 µm longum, basi 35–52 µm diam, apice 31–40 µm
diam. Ascosporae fusiformes, leviter curvatae, (18.5–)20–22.5(–
24.5)×(2–)2(–2.5) µm, L:l (8–)9.5–11(–12.5). Ad alteris Gnomoniae
speciebus ascosporae longitudine latitudineque differt. Ascosporae
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