rostratum. hornum. undulatum. Funaria hygrometrica. Physcomitrium pyriforme. fasciculare. Fissidens bryoides. adiantoides. taxifolius. Leucodon sciuroides. Cryphaea heteromalla. Leptodon Smithii. Neckera pumila. crispa. complanata. Anomodon viticulosus. Cylindrothecium Montagnei. Homalothecium sericeum. Thuidium tamariscinum. Plagiothecium denticulatum. sylvaticum. Rhyncostegium tenellum. Rhyncostegium depressum. confertum. megapolitanum. Thamnium alopecurum. Eurynchium circinnatum. striatulum. striatum. praelongum. Swartzii. hians. pumilum. crassinervium. piliferum. Isothecium myurum. Brachythecium velutinum. rutabulum. campestre. glareosum. albicans. Scleropodium illecebrum. Camptothecium lutescens. Amblystegium serpens. riparium. Hypnum polymorphum. chrysophyllum. cupressiforme. resupinatum. molluscum. filicinum. cuspidatum. purum. Hylocomium splendens. brevirostrum. squarrosum. loreum. triquetrum. _Tortula Hornschuchiana_, _Orthotrichum rupestre_, and _Orthotrichum Ludwigii_, _Bryum torquescens_, _Eurynchium circinnatum_, and _Eurynchium striatulum_ have been found by Mr. Mitten only, about Woolsonbury Hill. The plants growing on chalk, are: _Seligeria calcarea_, on inclined faces of chalk pits, and occasionally on detached chalk. _Seligeria calcicola_, in similar situations on Woolsonbury. This is nearly allied to _Seligeria pusilla_, and has the capsule always ovate. _Anacalypta caespitoso_ in some seasons is in plenty on Woolsonbury. Only two localities are known in Sussex, and it is not found elsewhere in Britain. _Bryum intermedium_ is frequent in chalk pits, and remarkable for having the fruit on the same tuft in all stages of maturity. _Encalypta streptocarpa_, Woolsonbury, under beech trees. _Neckera crispa_, on Woolsonbury and Newtimber; in fruit on the first hill. _Cylindrothecium Montagnei_, Saddlescombe. _Rhyncostegium depressum_, Newtimber woods. _Hypnum polymorphum_, Patcham embankment. _Hypnum chrysophyllum_, common everywhere. _Eurynchium circinnatum_, Clayton. The clay summits of the hills, as at Woolsonbury, give _Phascum alternifolium_ and _Weissia mucronata_, and _Physcomitrium fasciculare_ on Pyecombe downs. _Racomitrium canescens_ is frequent in similar localities, and fruited on Woolsonbury in December, 1858. _Tortula subulata_ and _Eurynchium hians_ are also frequent, the latter differing from _Eurynchium Swartzii_, its near ally, in its wider, not acuminate, leaves. The stiff soils of the hills furnish _Phascum rectum_, _Phascum curvicollum_, _Astomum crispum_, _Gymnostomum microstomum_, _Pottia minutula_, _Anacalypta lanceolata_, _Didymodon luridus_, _Tortula convoluta_, also _Phascum bryoides_ in disused roads. A rivulet at Grin Gap, near Newhaven, with its miniature ravine, gives _Webera albicans_, in fruit, _Trichostomum topnaceum_, and _Hypnum riparium_.