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Transactions of the British Mycological Society
Two forms of Stilbum tomentosum occur, one, taken as the type, with minute conidia, the other, var. ovalisporum A. L. Sm. (var. macrospora Ferr.), with conidia, 2·5–5 × 1·5–2μ. The latter appears to be the commoner in England. Both have glandular stalks.Both forms are frequently parasitized by a Cephalosporium, which has conidia, 5–12 × 2–4μ.Grimm cultivated the Cephalosporium. The fructification he obtained in culture was apparently a tuft of Cephalosporium conidiophores, not Stilbum tomentosum nor a Tilachlidium.Isaria brachiata (Batsch) Schum. is a Tilachlidium, T. brachiatum (Batsch) Petch (1940). T. pinnatum Preuss and T. subulatum A. L. Sm. appear to be the simple form of T. brachiatum.