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Æ C ID IU M CORNÜTÜM,
Horn-like Æcidium.
C l a s s a n d O r d e i i CRYPTOGAMIA FUNGI, Unn— N a t . O r d . GASTROMYCI,
Grew.—EPIPHYTÆ, Unk.
G EN E R IC CHAHACTER.
Peridia in foliis vivis parasitica, membranacea, apice dehiscentia, ore dentato
vel lacerato. Sporidia globosa, minutissima, libera, pulverulenta.
Peridia parasitic on living leaves, m embranaceous, bursting a t the apex, the
orifice dentate or torn. Sporidia very minute, pulverulent.
S P E C IF IC c h a r a c t e r .
Æ c id iu m cornutum ; peridiis ex maculo aurantiaco incrassato erumpentibus,
longissimis curvatis pallide bruneis ; sporidiis subglobosis.
Æ. Pen d ía very long, curved, pale brovpn, bursting from an orange-coloured
thickened spot. Sporidia subglobose.
Æ c id iu m cornutum, Pers. Obs. Mycol. 2. p. 4. t. 4. f. 2, S.— Syn. Fung. p. 205.
Alb. et Schwein. p. 115.—De Cand. Fl. Franç. ed. 3. v. 2. p. 247.—Ejusd.
Syn. p. 5 \.— Wahl. Fl. Lapp. p. 525.— Sow. Engl. Fung. t. 319 Gmel.
Syst. Nat. 2. p. 1472— Moug. et Nestl. St. Exsicc. No. 183— Schmidt et
Kunze, Deutschl. Schwaem. No. 110.— Hook. Fl. Scot. pt. 2. p. 14.— Grev.
Fl. Edin. p. 447.
L y c o p e r d o n corniferum, Fl. Dan. t. 803.
L y c o p e r d o n corniculatum, Fhr. Crypt. Exsicc. Dec. 20.
H ab. On the inferior surface of the leaves of Sorbus Aucuparia (the Moun-
tain Ash)j in Summer and Autumn, very frequent.
Pendía clustered, and issuing from a thickened, b rig h t orange-coloured
spot, about two lines in length, curved, slender, cylindrical, attenuated
towards the apex, which is shortly lacerate. Colour a dilute yellowish-
brown. Sporidia subglobose.
Æcicliuvi cornutum is a well known and conspicuous parasite,
plentifully infesting the leaves o f the Mountain-Ash or
Roan-Tree. I t is produced on the under surface of the leaves,
hut its presence is denoted by a bright reddish spot on the upper
surface. I have already made some observations under