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X Y L O M A ACERINÜM.
Sycamore-leaf Xyloma.
Class and O rd e r CRYPTOGAMIA l ’üN G I, im n— NAT. Obd. H YPOX YLA ,
De Cand. Grev.
G E N E R IC C H A R A C T E R .
Perithecia nigra, cornea, clausa aut irregulariter dehiscentia, vel minuta et soli-
taria vel majora et cotifluentia.
Perithecia (the part enclosing the sporular mass) black, corneous, bursting
irregularly, either minute and distinct, or larger and confluent
S P E C IF IC C H A R A C T E R .
X y l o m a a c e r i n u m ; tenue, late maculceforme, subrugosum'; perithecia Jiexuosa,
contigua, dehiscentia, intus albida.
X. thin, broad, in the form of spots, subrugose ; perithecia flexuose, contiguous,
dehiscent, whitish within.
X y l o m a acerinum, Pers. Meth. Fung. p . 6.—Syn. Fung. p . 104.—Alb. el
Schmein. p. 63.—De Cand. Fl. Franç. ed. 3. v. 2. p . 302.—Ejusd. Syn.
p . 63.—Nees, Syst. t. 2. f. 21. a.—Moug. et Nestl. Stirp. Crypt. Fog. No. 77-
—Schrvein. Fung. Carol. No. 266.—Hook. Fl. Scot. 2. p. Q.— Grev. Fl. Edin.
p . 367-
X y l o m a p u n c t a t u m , Pers. Obs. Mycol. 2. 1 0 1— Ejusd. Syn. Fung. p . 104.—
Alb. et Schrvein. 1. c. p . 63.—De Cand. 1. c. p . 303.—Syn. Fung. p . 63.—
Schrvein. Fung. Carol. No. 267.
S p h æ r ia raaculæformis, Ehrh.
S p h æ r ia subconfluens ? Puri. Midi. Fl. v. 3. p. 284. (not of S o w e r b y . )
M u c o r g r a n u l o s u s . Bull. Champ, p . lO p . t. 5 0 4 . f . 1 3 .
H a b . On the leaves of the common Plane tree, and also on Acer Platanoidcs
and campeslris. Very common.
Perithecia very confluent, forming thin, broad, black spots, from a few lines
to near an inch in diameter, the margin often irregular ; surface somewhat
rugose, and impressed with flexuose lines, which mark the future
dehiscence of the perithecia. The perithecia are whitish within, and, in
favourable circumstances, open freely, and discharge their contents. Sporuliferous
tubes filiform. Sporules very minute, oval. The variety called
punctatum is composed of generally distinct irregular spots, half a line to
a line broad, but very frequently passing by insensible gradations into
the common form.
This plant is so very frequent on almost every tree of the
common Sycamore, that it is unnecessary to describe it more
minutely. Most authors have agreed in keeping up the two
species I have brought together, and which I consider with the
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