Bull, H. G., in “Transactions of Woolhope Club” (1869). Fries admits them as distinct species in the new edition of his “Epicrisis.”
Hussey’s “Illustrations of Mycology,” ser. i. pl. 79.
Sowerby’s “British Fungi,” pl. 244.
Favre-Guillarmod, “Les Champignons Comestibles du Canton de Neuchatel” (1861), p. 27.
Sowerby, “English Fungi,” pl. 122; Smith, in “Seemann’s Journ. Bot.” (1866), t. 46, f. 45.