learned N e e s a b F s e n b e c k to be merely different states of
the same plant. Both may often be seen passing into each
other on the same leaf. Both varieties arc represented in the
annexed plate.
Fig. 1. a, Xyloma acerinum, nat. size,
tubes and sporules.
b, Perithecia open, c, Sporuliferous
i X f\â
i l
X Y L O M A SALICINUM.
Thick Sallow-leaf Xyloma.
S P E C I F IC C H A R A C T E R .
X yloma salieinum ; perithecia confluadia in receptacuh cartilagineo, albido,
crasso, vix dehiscentia, externe subtubercuhsa.
X. perithecia confluent in a white thick cartilaginous receptacle, scarcely dehiscent,
externally subtuberculose.
X yloma salieinum, Pers. Meth. Fung. p. 5. t. 2. f. 4.—Ejusd. Syn. Fung.
p. 103.— Alb. et. Schrvein. p. 62— Purt. Midi. Fl. v. 3. p. 318 Grev. Fl.
Edin. p. 368.
X y lom a leucocreas, De Cand. Fl. Franç. ed. 3. v. 2. p. 303.—Eju.id. Syn.
p. 63.—Mong. et Nestl. St. Crypt. Fog. No. 175.
H ab. Frequent on the living leaves of the common Sallow (Salix caprcea)
in the autumn.
Size extremely variable, even from that of a pin’s head to above half an inch
in diameter, and fully two lines in thickness. Margin rounded, irregular.
External surface deep shining black, somewhat tuberculose. Within
white, very firm, hard, cartilaginous. Perithecia very small, situated
immediately beneath the surface, roundish, very rarely opening. Spo-
ruliferous tubes and sporules so slender and minute that the highest magnifying
power does not exhibit their nature distinctly.
P er so o n mentions tbat be bas seen the perithecia of this
species dehiscent. D e Ca n d o l l e , on the other hand, never
succeeded in perceiving them in tbat state. To the latter testimony
I must add my own, tbough I have regularly sought
for tbe open perithecia whenever 1 have met tvith the plant.
IMr PuKTON is surely in error when he quotes Xyloma f
striæforme of M o u g eo t and N e s t l e r .
Fig. 2. a, X. salieinum, nat. size, b, A section, c, A section exhibiting the perithecia
magnified, d, Sporuliferous mass highly magnifed.
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