TÎM
hi
If h
- y
N
Æ C I D I U M l a c e r a t u m .
Brown ragged Æeidium.
Class and Oedeb CRYPTOGAMIA FUNGI, í ím —Nat. Oed. GASTROMYCT,
Link, Grev*
GENERIC CHARACTER.
Pendía foh is vivis pararitica, membranácea, apice dehiscentia, ore dentato vel lacéralo.
Sporidia globosa, minutissima, libera, pulverulenta.
Pendía parasitic on living leaves, membranaceous, bursting at the apex,
the orifice dentate or torn. Sporidia very minute, pulverulent.
SPECIFIC character.
Æcidium laceratum; peridia densissime aggregata, elongata, subimmersa, pal.
lido-brunnea, irregulariter lacérala ; sporidiis brunneis, profusis.
Æ . p e r id ia d e n s e ly a g g r e g a te d , e lo n g a te d , s u b im m e rs e d , p a le b roWn , ir r e g
u la r ly to r n ; s p o r id ia b row n , co p io u s.
Æ c idium la c e r a tum . Sow. Fung. t. 318.— D e Cand. FL Franç. v. 2 . p . 2 4 7 .—
Fjusd. Syn. p . 5 1 .— Grev. FL Fdin. p . 4 4 7 .
Æcidium Oxycanthæ, Pers. Syn. Fung. p. 206.—Alb. et Schrv. p. 115.—
Schmein. Fung. Carol. No. 432.
H ab. On the nerves and petiols of the leaves, the fruit, and even the young
branches of the Hawthorn (Cralægus Oxycanthus), in summer and au-
tumn, abundant everywhere.
Plant distorting and swelling the part on wfiich it grows. Peridia clustered,
Imear-oblong, more than half-immersed; when young entire, then
splitting at the apex, and, as they protrude, becoming torn in a very irregular
manner to the base of the protruded portion. The lacerated p art
appears in the form o f filaments to the eye, and even under a pocket mag-
nifier ; these apparent filaments^ which are very numerous, tu rn out un-
der a higher magnifying power, to be composed o f nothing more than a
number of linear, hyaline cellules, arranged lengthwise, which separate
from one another w ith the greatest facihty, and, after the laceration has
taken place, are constantly falling away one by one, till scarcely any
appearance o f filament remains. The cohmr of the immersed portion of
the peridium is quite white, th a t of the protruded portion of a pale
brown. Sporidia globose, very copious, easily escaping, pale brown.