Friesia IV, 3

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the finder, ø. W i n g e, however, seems inclined to regard as an
independent, perhaps new, species.
From M e i n h a r d M o s e r I have received a watercolour of a
form, quite white with faintly yellow scales on the capo The same
form was found by the present writer in 1950 in Søllestedgård Skov.
It greatly resembles P. exeellens but has not the large spores of the
latter.
VII. TUE ARVENSIS GROUP
Medium-sized to large species. Pileus white or yellow, smooth or
with concolorous scales. Gills narrow, pale or flesh colour. Gill edge
sterile, pale. Stem often slender and hollow. Ring sheathed above,
on the underside with cog-wheel or dentate edge. Flesh white, or in
the stem slightly flesh-coloured. Smell almond- or anise-like. Marginal
cystidia subglobate, rarely clavate to bottle-shaped. Spores
ellipsoid. Schåffer reaction positive, strong. In woods, gardens, fields
or meadows. Compare the Xanthoderma gr oup.
KEY TO SPECIES
Stem slender with abruptly swollen, bulbous base, which
is often more or less marginate or flattened. Pileus naked,
rarely cracking into scales. In woods, mostly on needles ...
Stem clavately swollen towards base or almost cylindrical.
Rarely in dense wood. Only one species on needles .
Spores 5-6l1 long. Base of stem .mor e or less globate.
Deciduous woods or coniferous woods .
Spores longer (6-8 X4-511). Base of stem marginate-bulbous.
Under Picea .
Small, thin-fleshed species. Ring with or without obsolete
cog-wheel, Pileus 5-8 cm, white or sulphur-colour, turning
dark yellow on the slightest pressure. Stem thin. Spores
5-6 X 3-411. In deciduous and coniferous woods .
3. 1. P. siZvieoZa
Large, thick-fleshed species. Ring with marked cog-wheel.
Pileus 8-12 cm, white or sulphur-coloured, turning less
yellow on pressure. Stem thick. Spores 5-6.5 X4-511. In
woods under Pie ea 2. P. tenuivoZvata
F R IES I A IV
10
2
5
3
4