ol 
owing to the unevenness of the matrix. A microscopic section 
shows it to be thickly studded with cystidia. Most of the 
cystidia are surmounted by a globular apical expansion 2 to 3 
across. Lhe whole cystidium averages from 20 to 25 @ in 
length, from 10 to 15 mu of which project above the surface of 
the hymenium. The basidia are peculiar in shape, being much 
flatter above where they bear four, rarely two, sterigmata. The 
whole basidium measures from 12 to 15 ein length by 5 to 6 mm 
in diameter. The spores are colourless, oval, 5-6 x 4-5 pM, 
with large, very apparent nuclei. - 
The capitate  cystidia, the flat-topped basidia and the 
large nuclear spores render this species easy of recognition micro- 
scopically. To the naked eye the dead white hymenium on 
the hving and dead stems at their ground level, the matting of 
earth by the hyphe of the fungus, and the attenuated shoots of 
the affected plants show the gardener at once what he has to 
deal with. The only treatment is burning the diseased plant. 
It is useless to separate the apparently healthy shoots, 
Specimens of the fungus have been deposited in the Her- 
barium of the British Museum and have been placed next 
Peniophora terrestris Mass. 
Corticium (Penio phora) C hrysanthemt. 
Hymenium chalk white, effused, incrusting, indeterminate, 
uneven from the irregularities of the matrix, substratum fila- 
mentous. Spores hyaline, oval with large nuclei 5-8 x 3-5 
Basidia flattened at the summit 10-15 x 5-9, bearing four, 
rarely two, sterigmata. Cystidia numerous, 18-2 SMX 4-Sm, pro- 
jecting from 10-] 5 #« above the surface of the hymenium with 
a spherically dilated apex about 3 in diameter. 
Parasitic at the base of living Chrysanthemum stems, autumn. 

NOTES ON THREE UNCOMMON FUNGI, 
By Cec H. § B. Perceval. 
Agaricus (Pleurotus ) corticatus Fr. 
On dead beech at top of the Dene Lane, Longwitton, Nov. 
1902 and 1904. 
Agaricus (Pleurotus ) serotinus Sch, 
On dead horsechestnut in Longwitton Garden House field, 
Nov. 13, 1904. 
