Anthostomella alchemillae  

Anamorph: not known.
Teleomorph: stromata absent. Ascomata perithecia, ± globose to slightly oblate, 280-350 µm diam. and 250-330 µm tall, with a well-circumscribed slightly conical neck to ca 80 µm in length, sometimes curved; scattered, the base immersed in the mesophyll and the neck erumpent from the upper surface of the leaf. Clypeus absent. Ascomatal wall black, leathery, composed of several layers of irregularly shaped angular cells 12-18 µm diam. with an internal layer of almost hyaline flattened tissue. Interascal tissue of thin-walled unbranched paraphyses ca 4 µm diam., evanescent at maturity. Asci 105-125 x 15-19 (-25) µm, the width dependent on orientation of the ascospores, ± cylindrical, the apex rounded and the basal region short and hardly tapered, rather thin-walled; apical ring hardly visible in lactic acid but staining blue in Lugol's iodine, T-shaped in section with the upper part 3.5-4 µm and the lower part 2.5-3 µm diam., ca 3 µm in height; 8-spored. Ascospores arranged irregularly uniseriately, 15-18.5 x 9-10 x 8-9 µm, fusiform-ellipsoidal, slightly flattened laterally, dark chocolate brown when mature, aseptate, smooth-walled, with an inconspicuous ± straight circumferential germ slit extending around the spore on its narrow face, without a gelatinous sheath or appendages.

Map of the known distribution in Great Britain and Ireland.