Anamorph: Endothiella sp. Conidia 3-6.5 x 1-1.5 µm.
Teleomorph: Stromata 0.5-2 mm diam, pale yellowish to yellow-orange. Ascomata 180-410 µm diam., usually 10-20 per stroma, neck 180-730 µm long. Asci 25-40 x 4-7 µm. Ascospores 5.5-10 x 2.5-4.5 µm, not constricted at the septum.
Not formally assessed, but probably extinct in GB&I. Hoegger et al. (2002) suggest that Cryphonectria radicalis is much less common in Europe than C. parasitica and may have been out-competed by that species where they are sympatric. C. parasitica has recently been reported from GB&I, and was the subject of eradication measures.
Cryphonectria parasitica, cause of the devastating chestnut blight disease, differs in having slightly larger ascospores, 7-11 x 3.5-5.5 µm in size.
On dead branches of hardwood trees, especially Castanea but also recorded from many other genera.
Sowerby's collection was from S Hampshire.