Lachnum pteridicola (Dennis) Spooner 1987
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Lachnum pteridicola (Dennis) Spooner 1987
The type material is, unfortunately, rather scanty and I have not examined microtome sections for details of the excipular structure. The walls of the ectal cells are mostly thickened and somewhat refractive, but the structure is otherwise quite characteristic of the genus.
This is a distinctive species which may be readily recognized by the reddish-brown disc, small spores and yellow-brown hairs. The latter have thickened walls which appear also to have a secondary internal thickening so that the lumen is very reduced and appears as a narrow central band. The granulation on the walls of the hairs is continuous but uneven, being coarser in patches, particularly near the apex. In addition the walls are encrusted by small, irregular particles of brownish, resinous matter which appear insoluble in distilled water but readily dissolve in Melzer's reagent.
It is uncertain to which species L. pteridicolum is most closely allied. Two tropical pteridicolous species, Dasyscyphus ulei (Winter) Saccardo and D. chermesinus Cash have red discs and are closely related to each other but differ from L. pteridicolum in having smaller apothecia, much larger, fusoid spores and, hyaline, thin-walled hairs. They are discussed by Haines (1980).