Differentiation in Coprinus lagopus

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Abstract
Fruit-body expansion was studied in Coprinus lagopus (sensu Buller) following surgical procedures. Elongation occurred after denuding mushroom caps of essentially all peripheral scales. Young primordia (1–5 mm) failed to develop after vertical bisection. Older primordia (e. g. 10 mm) expanded 3–4-fold after vertical bisection or quadrisection, underwent autolysis and basidiospore production. An amorphous brown gel in the stipe lumen disappeared during development of bisected primordia. Stipes isolated from primordia expanded autonomously and exhibited negative geotropism when incubated upside down or when the stipe apex was removed. Displacement of charcoal particles dusted on intact stipes revealed the most active zone of expansion to be the upper mid-region of the stipe. Segmented stipes likewise showed most active elongation in the mid-region. Vertically bisected stipes also expanded.

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