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U R EDO EFFUSA.
L a r g e orange Uredo.
C lass a n d O r d e r CRYPTOGAMIA FUNGI, L in n .- ilA i. O r d . G A S T RO M YC l, Grev.
—EPIPHYTÆ, Link FUNGI, Juss. De Cand. Hook.
GENERIC CHARACTER.
Peridium verum 0. Sporidia plerumque globosa non septata, nuda, libera. Plantulæ
“ sub epidermide foliorum lierbacearum ortæ et epidermide rupta, facilè
dispersæ" (D e Cand.). Epidermis jieridio simillima.
No true peridium ^membrane enclosing the sporidia). Sporidia mostly globose,
unilocular, naked, free, bursting through the epidermis of the leaves
of herbaceous plants, and easily dispersed ; epidermis, bearing a strong
resemblance to a true peridium.
S PEC IF IC c h a r a c t e r .
U r e d o effusa ; minialo-aurantia, lata, puherulenta, nunc hypophylla in nervis
petiolisque spiroeoe ulm.arioe, nunc eliam ad calyces rosarum. Sporidia numerosa
subrotunda.
U. bright reddish-orange, broad, pulverulent, hypophyllous on the nerves
and petiols of Spiræa ulmaria, or even on the calyx of various roses.
Sporules numerous subglobose.
U r e d o effusa, Strauss, in Annal. Soc. Wetterav. 2. p. 9 1 . a & /3 Grev. Fl.
Edin, ined.
U redo pingues, De Cand. Fl. Franç. v. 2. p. 235.—Syn. p. 49.
U r e d o miniata afPers. Syn. Fung. p. 2 16 .—Alb. et Schw. p. var. yy. p. 123.
U r e d o spirææ, Sow. Eng. Fung. t. 398.
U redo Rosæ /3, De Cand. Fl. Franç. v. 2. p. 232.
U redo aurea, Purt, Midi. Fl. v. 2. p. 725.
H ab. On the petiols and veins of the under surface of the leaves of Spiræa
ulmaria. Petiols, veins, flower-stalk, and even calyx of various roses ;
especially Rosa spinosissima, R. tomentosa, and R . rubiginosa. Found in
England by Mr SowERBY and T homas Puhton, Esq. Balmuto, Miss
E. and Miss M. Boswell. Plentiful near Edinburgh. Autumn.
Very conspicuous, from its large size, and vivid orange colour. Distorting
the veins and petiols, irregular in form, and spreading over a large surface,
particularly when it attacks the seed-vessel of the Roses. Very
pulverulent, staining the fingers when touched. Surrounded by the remains
of the ruptured epidermis, which is of a pale colour. Sporules
numerous, subglobose, reddish-brown under the microscope, pale when
dried.