One of the most common is the rust found on the leaves of the enchanter’s nightshade (_Circæa lutetiana_), sometimes nearly covering the under surface with its tawny snuff-coloured spores Plate VII. fig. 135). The plant on which it is found is rather local, but the rust (_Uredo Circææ_) seems to abound wherever the plant on which it is parasitic flourishes. Another fungus of a very similar external appearance may be collected, more rarely, from the leaves of the same plant; but in this the spores are two-celled, or divided by a transverse partition. This fact is mentioned to guard against disappointment, should the spores be found to differ from the characters of this section, and to show that the microscope is essential to the study of fungi. The spores of the true Uredo are globose and without any partition Plate VII. fig. 136). [Illustration: Plate IX. W. West imp. ] We may also observe that a very interesting species may be found on several species of St. John’s-wort (_Hypericum_), but especially on the under surface of the leaves of the Tutsan, covering them with its golden-coloured spores (Plate VIII. fig. 174). Another occurs on the leaves of some of the wild garlics (_Allium_); one is not uncommon on some of the stitchworts; another on saxifrages; another on willow-herbs (_Epilobium_), and one on the leaves of the cowberry. All of these have yellowish spores. A species with brown spores occurs on sea-lavender (_Statice_). Space to write on our own part, and patience to read on the part of others, induce us to dismiss all these species with the bare allusion to them and the plants on which they may be found. Some of them may occur in one locality and some in another, and enough has perhaps been said to enable any one to place any that he may find in the proper genus, if not with the scientific name. From the numerous instances we have met with of persons wholly disinterested in the subject, collecting and making inquiries concerning the bright orange patches next to be referred to, we are led to conclude that most persons have, at least, seen them. These patches of orange-coloured powder burst through the cuticle, and appear on the young branches of wild roses, extending sometimes for two or three inches in length Plate VII. fig. 147), and form one of the most beautiful and obtrusive of the dust-like fungi. It is not confined to roses; but the meadow-sweet, on which it is also found, does not grow in localities where its parasite is so liable to meet the gaze of the ordinary wayfarer. The habit of this rust is more or less that of those which are associated with it. The pustules are not small and orbicular as in most instances in other groups (except _Polycystis_), but are large and irregular, and generally but few together or single. The spores are variously coloured, and have peduncles, or footstalks, of a greater or less length. In the rose rust these spores are profuse, but the peduncle is short (Plate VII. fig. 148).