BioImages: The Virtual Field-Guide (UK)

Miyagia pseudosphaeria (Mont.) Jørst. (a rust fungus)

Date 19 August 2007
OS grid ref SU56
Lat/Lon 51° 20' N, 1° 20' W
Location Vice County: Berks, VC22, England
Voucher 19/08/2007[E]
(Please quote this in any queries about this record)
Stage or state Uredia (II)
Record Summary Uredia and telia, on underside of sensecent basal leaves of Prickly Sowthistle
Associated organism: on underside senescent leaf (basal) of Sonchus asper
Identification Notes: Small punctate, pale orange-brown uredia, bursting through lower epidermis, each surrounded by a brown ring of paraphyses. Uredospores ±cylindric-ellipsoid, echinulate, thick-walled.

Telia similar but darker, dark brown to black. Teliospores: single-celled (mesospores), shortly ellipsoid, mid brown, stalked, with many pores.

There were also a few larger subcuticular uredia which were smooth and lacked the palisade of dark paraphyses. These might well be a different species of rust.

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