The North American species of Psathyrella.

1972]

PSATHYRELLA

501

FIGS. 583-593. Figs. 583-584, P. subpalustris: 583, pleurocystidia; 584, cheilocystidia. Figs.
585-587, P. acutoconica: 585, caulocystidia; 586, pleurocystidia; 587, spores. Fig. 588, spores
of P. rainierensis. Fig. 89, spores of P. cubensis. Figs. 590-593, P. fagetorum: 590, spores;
591, pleurocystidia; 592, cheilocystidia; 593, caulocystidia.