380 UREDINOPSIS 
pedicels as long as or longer than the spore, colourless, densely 
verruculose, averaging 20—26 x 12—14 4; epispore about 1 p 
thick ; (2) larger, about 4mm. diam., more elevated, pustular, 
without (?) peridium, but with what looked like hyaline clavate 
thin-walled paraphyses; spores ovate-fusiform, colourless, smooth, 
thickened at the apex with a conical, acute, usually oblique 
process, 85—45 x 10—12 yw; pedicels short; epispore thin. 
Teleutospores. Scattered singly throughout the mesophyll, 
Le. not in definite clusters, roundish-oval or oblong, 1—3 
(mostly two) celled, 18—24~x 15—16 4; epispore very thin, 
almost perfectly hyaline and smooth. 
On Polypodium Phegopterts. Europe. Not uncommon; 
appearing about the time when the fern-sori are being formed. 
The uredo-sori are of about the same size as a fern-sporangium, 
and are scattered among the fern-sori. (Fig. 284.) 
The description and figures are taken from a German specimen. The 
fungus will no doubt be found in this country, if looked for ; it is rather 
conspicuous on account of the uredo-sori. The warts on the uredospores 
(no. 1) are clearly perceptible even when wet; the peridium is pseudoparen- 
chymatous, with cells isodiametric near the apex, becoming longer and 
prosenchymatous towards the periphery ; texture rather tough. and con- 
sistent, not friable. Fischer gives a beautiful and accurate drawing of the 
nature of the peridium and its relation to the epidermis (/.c. fig. 310). 
The uredospores (no. 2) are described by Arthur in his generic character 
(N. Amer. Flora, vii. 115) as smooth, except for two longitudinal, thickened, 
more or less warted ridges, which I could not discern. 
As in Hyalopsora, Arthur prefers to call the two kinds of uredospores 
respectively eecidio- and uredo-spores: the same remark may be made as 
under that genus, for the supposed ecidiospores occur in company with 
the teleutospores on the dying parts of the frend, and are said to germinate 
only after having passed the winter. Uredospores (no. 2) can germinate 
at once, 
The teleutospores are to be found in large numbers in the tissues 
immediately round both kinds of sori, and simultaneously with them. 
They are borne on short lateral branches of the mycelium. Dietel, who 
gave a long account of this fungus (Ber. Deutsch. Bot. Gesell. 1895, xiii. 
326), showed that in the allied European species, U. Struthiopteridis, the 
teleutospores germinated easily with a typical basidium (occasionally 
branched) which bore round basidiospores. 
DistrisuTion: Germany, Switzerland, Italy. 
