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E R IN E U M J u g l a n d i s .
Walnut Erineum.
S P E C IF IC CHARAC TER .
E rineum J u g la n d is ; hypophyllum, subquadratum, prqfunde immersum, album ;
peridiis tenuibus subereclis, cylindricis, apice attenuatis.
E. on the lower surface of the leaf, of a somewhat square form, deeply immersed,
whitish; peridia slender, suberect, cylindrical, attenuated at
the apex.
E r i n e u m Juglandis, Gcertn.—De Cand. Fl. Fran;, v. 6 . p . I S .—Enc. Meth.
V. 8. p. 2 1 1 .—Schleich. Cent. Exsicc. 4. No. Q2.—Kunze, Mycol. Hefte, 2.
p. 170.—Grev. Fl. Edin. p. 450.
E rineum ju g la n d in um , Pers. Myc. Eur. 1. p. 2.
E rineum subulatum, Grev. Edin. Phil. Journ. v. 6 . p. 15. t. 2 . f. 4.
P hyllerium juglandinum, Fries, Obs. Mycol. 1. p. 218.—Deutschl. Schrvacm.
Ease. 8. No. 197-
H ab. On the leaves of the Walnut (Juglans regia), in Summer, not unfrequent.
Plant of a pale colour, and remarkable for its quadrangular form, occasioned
by being confined between the parallel veins of the leaf, soft and
velvety to the touch, plane, deeply immersed in hollows of the leaf.
Peridia slender, suberect, cylindrical, rather long, and attenuated towards
the apex.
D e C a n d o i . l e has remarked of this species, that he has
considered it a parasitic plant, in deference to other naturalists,
being at the same time unable to bring forward any positive
proof to the contrary. He adds, that he shall not be astonished
if future observations demonstrate the peridia to be nothing
more than pubescence subjected to a diseased developement.
This is by no means improbable.
Fig. 2. a, E. Juglandis upon a leaflet o f Juglans regia, natural size, b, Peridia,
magnified.
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