There are not many features in the rest of the species of this genus of sufficient interest to the general reader or microscopist to render it advisable to furnish any detailed account of them. We may, however, note that in a species found on the leaves of the common cock’s-foot grass the spores are large, obovate, and rough, with minute granules (figs. 117, 118). This species is known botanically as _Ustilago_ _salveii_, and externally bears considerable resemblance, except in the size and colour of the spores (fig. 119), to another species much more common, and which occurs on the leaves of _Poa aquatica_ and _P. fluitans_. The last-named species forms long parallel sori, extending often for several inches along the leaves of the aquatic grasses just named, giving them a very singular appearance (Plate V. figs. 105, 106). The spores are small (fig. 107), not being more than one-fourth the length of the last species, and smooth, whilst those are minutely granulated. An interesting species occurs, very rarely, on the stems of such grasses as _Aira cæspitosa_ and _A. aquatica_. The sori are in bands at regular distances apart (Plate VI. fig. 120), each band being composed of a number of short parallel sori (fig. 121). The spores are not more than one-third of the size of those in _U. longissima_. Sedges are also subject to attack from other species of smut; one of these (_U. olivacea_) appears to convert the seeds into a fine olive-coloured dust (Plate VI. fig. 126), which gives to the fruit a similar appearance to that presented by corn when attacked by _Ustilago segetum_. Another species, which also absorbs the seeds, becomes hardened and consolidated more than in any other species, and, though larger than the normal seeds, still retaining their form (figs. 109, 110). This is _Ustilago urceolorum_, the spores of which are also figured (fig. 111). The beaksedge (_Rhyncospora alba_) suffers from an allied species which affects it in a similar manner (Plate V. figs. 96, 97), but is not equally common. The spores of _Ustilago utriculosa_, found on different species of _Polygonum_, instead of being granulated, are reticulated on the surface (Plate VI. figs. 114, 116). The chief interest attaching to _Ustilago antherarum_ consists in its habitat, for it is developed in the anthers of the flowers of the bladder campion, and other plants of the same natural order. The anthers are much swollen and distorted by this parasite, which is not uncommon, though easily overlooked unless specially sought after (Plate V. figs. 102-104). A list of all the British species will be found at the close of this volume. It will be noted that as in the genus _Æcidium_ the prevailing colour of the spores is orange, so in the genus _Ustilago_ it is black, with a purplish or violaceous tinge.