STUDIES ON THE AGARICACEAE OF HOKKAIDO. I

STUDIES ON THE AGARICACEAE OF HOKKAIDO. I. 27
thin, taste and odour none; lamellae free, white, equally attenuated
toward both ends, ventricose, rather crowded, very scarcely serrulate
on the edges; stipe 7-15 cm. long, 5-10 mm. thick, attenuated upward,
not bulbous at the base, powdery-squamulose, scales subconcolorous
or paler, white and stuffed within; volva membranous, concolorous
with the stipe or white with yellowish or orangish colored small dots,
ensheathing the base, large, ample, up to 4-5 cm. long, persistent;
spores white in mass, hyaline, globose, 12-14 fl, with a large, central
gutta or granular contents.
Hab. on the ground in woods. Summer to autumn. Ishikari
(Mt. Taisetsu, Nopporo).
Distr. Japan (Hokkaido, Honshu), Europe and North America.
Jap. name. Kabairo-tsurutake (KAWAMURA).
:t Amanitopsis albida (FR.) IMAI
Bot. Mag. (Tokyo), XLVII, 429, 1933.
Agaricus (Amanita) vaginatus a piIeo albida FR. Syst. Myc. I, 14, 1821.
Agaricus (Amanita) vaginatus var. albida FR. Epicr. Myc. 11, 1838.
Agaricus (Amanita) vaginatus b) tot a alba FR. Hymen. Eur. 27, 1874.
Amanita vaginata var. alba GILL. Hymen. Fr. 51, 1874-GILBERT, Genre
Amanita, 142, 1918.
Amanita vaginata subsp. plumbea var. alba KONR. et MAUBL. Icon. Sel.
Fung. I, 33, 1924.
Solitary or scattered, edible. Pileus 5-10 cm. broad, campanulate,
then convex to plane or slightly umbonate; surface white, besprinkled
with white or grayish colored patches of volva, striate on
the margin; context white, thin, taste and odour none; lamellae free,
white, broader in front, moderately crowded; stipe 10-18 cm. long,
8-12 mm. thick, slightly attenuated upward or nearly equal, not
bulbous at the base, concolorous; volva membranous, large, free,
white or grayish, persistent; spores white in mass, hyaline, 10-
12.5 ,u, with a large central gutta.
Hab. on the ground in woods. Late summer to autumn. Ishikari
(Sounbetsu).
Distr. Japan (Hokkaido), Europe and North America.
Jap. name. Yukitsurutake (IMAI).
Amanita nivalis GREV. has been treated by many as a white form
of Amanitopsis vaginata, but REA has described that the spores of
Amanitopsis ni1!alis (GREV.) REA are oblong eIlipsoidal, 11-12 x 9 fl,