Bonsoir tous
While searching for aero-aquatic fungi in a boggy/muddy area in woodland recently I found an Acer pseudoplatanus leaf which had, running along the leaf-veins of the underside, good material of a Nectria-like pyrenomycete.
Working through Rossman's Mycol Pap. no. 150 "The Phragmosporous Species of Nectria . . . " has led me to suspect that this is Calonectria pyrochroa on the following grounds:
* habitat on the underside of a fallen rotting leaf
* orange coloured perithecia covered by warts/loose globose bodies; not collapsing on drying
* no stroma
* perithecial wall apparently of two layers (how some of you guys cut those beautiful sections I don't know! it's beyond me . . .)
* ascospores clustered/fasciculate in the asci
* ascospores long, curved, fusoid, all 3-septate when mounted in lactophenol
* ascospore dimensions 57-90 x 9-10.8µm (this is slightly larger than what appears in the literature - spores measured living and in water)

there were certainly Cylindrocarpon type conidia around, but there were also other anamorphic fungi present and it was hard to be certain of associations.

Any comments or suggestions gratefully received

amitiés
Chris