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E R Y S IP H E ADUNCA.
Hooked Erysiphe.
C l a s s a n d O r d e r CRYPTOGAMIA FUNGI, Lmn— GASTEROMYCETES,
O r d . IV. SCLEROTIACEI, Fries.
G E N E R IC C H A R A C T E R .
Peridium glohosum, carnosum, ßoccis decumbentibus impositum, sporangiolis soli-
tariis vel pluribus refertum.
Peridium globose, carnose, seated on decumbent flocci, and containing one
or many sporangiola.
s p e c i f i c c h a r a c t e r .
p R Y S i P H E adunca ■ floccis matricalibus ejfusis, albis, radicantibus simplicibus,
rectis, kmgitudine cequalis, apice arete aduncis, demum incurvis elevatis.
E. primary flocci effused, white, the radical ones simple, straight, equal in
length, closely hooked a t th e apex, a t length incurved and elevated.
E ry s iph e ad u n ca . Link, in Willd. Sp. PI. v. 6. Pt. 1. p. 111.
E ry s iph e Populi, De Cand. Ll. Franç. v. 6. p. 104.
E ry s iph e Prunastri, De Cand. 1. c. p. 108.
E ry s iph e clandestina, Bernard, St. Sicil. 3. p. 20 . t. 4. f. 4¡.flde Link.
A lphitomorpha ad u n ca , Wallr. in Verb. Nat. Freund. 1. p. 37-
H ab . On both surfaces of the leaves o f various species of Poplar, Widow,
Elm, and other trees and shrubs, not unfrequent.—I t has also been recently
communicated to me from Oxford by Mr Baxter.
F irs t appearance o f the plant, a delicate, effused, white web, composed of
very fine, short, densely entangled filaments. In th e midst o f these,
the peridia are produced, in a scattered or aggregate manner, o f a minutely
globular form, pale at first, b u t when mature, of a nearly black
colour. Attached to the base of each are numerous, radicular, straight,
simple, white diverging filaments, equal in length, and closely hooked
or doubled back underneath at the apex. When the plant is mature,
the radicular filaments are curved upwards, rising above the peridium.
Sporangiola several, oval, containing three or four sporidia.
The most beautiful of tbe genus. Under a pocket magnifier,
tbe peridia, witb tbeir radicular filaments, resemble little