It is not a very desirable occupation to search a bed of nettles, and turn over the individual leaves to look for minute fungi. A very pretty _Æcidium_ is nevertheless far from uncommon in such a habitat. Fortunately it occurs very often on the petioles of the leaves and on the stem, distorting them very much; and in such situations flourishing, apparently, more vigorously than when occupying the under surface of the leaves (Plate I. fig. 10). In the latter situation the clusters of peridia are small, seldom exceeding a dozen in a spot, but several spots may be found on the same leaf. On the stem they are clustered around for upwards of an inch in length, and their bright orange colour in such a situation renders them very conspicuous objects. The peridia are always closely packed together upon a thickened base, and offer but slight variations from the forms already enumerated, save that they widen slightly at the mouth, so as to become nearly campanulate. The spores are orange, and very profuse. During the past summer we noticed, for the first time, a very pretty little species of cluster-cup (_Æcidium_) on the wood sanicle (_Sanicula Europæa_) in Darenth wood. It was far from uncommon, and we believe it to be specifically distinct from its nearest ally, found on the earthnut leaves, and those of some other umbelliferous plants. The little cups are in small clusters of four or five together, on the under surface and on the petioles; they are small, but the teeth are relatively large, white, and distinct. The spores are of a pallid, yellowish colour, and not so profuse as in the last species. A darker spot on the upper surface of the leaf generally indicates their presence. This species was found many years ago by Carmichael at Appin, and called by him _Æcidium saniculæ_; but we find no notice of its occurrence since, though it seems to be far from uncommon at Darenth, and probably elsewhere, should the sanicle be common also. Recently we found the bedstraw cluster-cup (_Æcidium galii_) on the great hedge bedstraw (_Galium mollugo_), and as it has not been figured before, we have included it amongst our illustrations (Plate II. figs. 15-17). Though very insignificant when occurring on the small leaves of the yellow bedstraw (_Galium verum_), it is a prominent object on the above-named species. We received, for the first time, in July, 1864, from Mr. Gatty, student at Winchester, a portion of a plant of _Thesium humifusum_ (which is by no means common in Britain), covered with beautiful cluster-cups of a species never before recorded as occurring in this country (Plate III. figs. 50, 51) named _Æcidium Thesii_, but which is far from uncommon on the Continent. It occurred in this instance on the Downs, in the vicinity of Winchester.