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On Diatrype stigma. Nectria found by Sue Rogerson. 15 February 2009 Hampshire. Photograph copyright Leif Goodwin
Globose with a small papilla, orange red, to about 0.2 mm across
On pyrenomycetes such as Diatrype stigma
Spores ellipsoidal, slightly constricted/waisted, finely rough, 1 septa, drops (7-11) x (4.5-5) µm2
Note that the specimens in the photograph have unusually large spores - 14x6, 13x7, 15x6, 13x7, 13x6 µm2 - inconsistent with N. episphaeria, although the appearance is identical. According to Gary Samuels, a Nectria/Cosmospora specialist at the United States Department of Agriculture who has examined specimens, they are not N. episphaeria and they are either a yet to be determined known species, or one new to science.
Spores viewed with a x100 immersion objective. 15 February 2009 Hampshire. Photograph copyright Leif Goodwin
Ascocarp and asci viewed with a x40 objective. 15 February 2009 Hampshire. Photograph copyright Leif Goodwin