Rust, Smut, Mildew, & Mould: An Introduction to the Study of Microscopic FungiCooke, M. C. (Mordecai Cubitt)
Science
Rust, Smut, Mildew, & Mould: An Introduction to the Study of Microscopic Fungi
Cooke, M. C. (Mordecai Cubitt)
Phytopathogenic fungi -- Great Britain
We have by no means exhausted the catalogue of Fungi belonging to this
genus found in Britain, nor even those commonly to be met with; but the
fear of prolixity, and the desire to introduce a description of other
forms into the space still remaining to us, prompt us to dismiss these
two-celled brands with but a brief allusion to such as we cannot
describe. Box-leaves are the habitat of one species, and those of the
periwinkle (Plate VI. fig. 132) of another. One vegetates freely on the
leaves of violets through the months of July and August, and another
less frequently on the enchanter’s nightshade. Several species of
willow-herb (_Epilobium_) are attacked by one _Puccinia_ (Plate IV.
figs. 78, 79), and a single species by another. Plum-tree leaves,
bean-leaves, primrose leaves, and the half-dead stems of asparagus, have
their separate and distinct species, and others less commonly attack the
woodruff, bedstraw (Plate VIII. figs. 172, 173), knotgrass, ragwort, and
other plants less common, more local, or, to the generality of the
non-botanical, but imperfectly known.
We have found, not uncommonly in the autumn, the scattered pustules of a
brand on the stems and leaves of the goat’s-beard, occupying the places
which were scarred with the remains of cluster-cups that had flourished
on the same spots a month or two previously (Plate IV. fig. 76). The
pustules are by no means minute, but elongated and bullate; the spores
beautifully studded with warts (Plate IV. fig. 77). This species cannot
certainly be identical with _Puccinia compositarum_ (Schlecht), _P.
syngenesiarum_ (Lk.), or _P. tragopogonis_ (Corda). In none of these do
the spores appear to be warted, and the habits of both the latter are
different. Its nearest associate appears to be _P. centauriæ_ (Corda),
at least in the fruit, and whilst the form and character of these organs
are considered of any value in the determination of species, smooth
spores cannot be associated, we think, with tuberculate or echinulate
spores under the same name.
In the spores of the species to which attention has been more specially
directed we have types of the principal forms. In the “corn-mildew” they
are elongated, and tapering towards either end; in the “coronated brand”
the apex is crowned with spicular processes; in the “wind-flower brand”
the entire spores are echinulate; in the “mint brand” they are globose;
in the “composite brand” elliptic; in the “earth-nut brand,” nearly cut
in two at the septum; and in the “dandelion brand,” so variable in form
that no two are precisely alike. On the other hand, all are
characterized by a transverse septum dividing each spore into two cells.
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CHAPTER V.
_COMPLEX BRANDS._
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