3380 THE JOURNAL OF BOTANY 
The plants described are: Potentilla mixta Nolte, Filago Jussiai 
Coss. & Germ. (F’. patted es Presl), Mercurialis ovata Sternb. & Hoppe, 
Cares Kochiana DC., Lolium linicola Sond., and Triticum biflorum 
Brign. A few pages lane on he has the first British record of 
Piso: confusa Jord., under the name of F’. agraria. Mitten was 
also a contributor to eds Supplement to English Botany, both as dis- 
coverer and author; he wrote the descriptions of Gymnomitrium 
adustum (t. 2925) and Lolium linicola (t. 2955). 
By this date (1848) Mitten had begun the study of exotic as well 
8 verwo ra 
little before 1851. Both T. Taylor and W. Wilson had hitherto 
been associated with the Hookers in working out various collections, 
but the former died in 1848, and Mitten, as he states in one of his 
letters to Sir William Hooker, had then to rely on his own judge- 
ment. so far as liverworts were concerned. Mitten’s letters of this 
covered Leersia oryzoides in three places on Henfield Level, in 1844, 
and Mitten collected it at Pond Leigh, near Cuckfield, in 1847 —the 
first two records for Britain. 
In 1849 Sir William Hooker offered Mitten the or of 
his herbarium, in the place of J. E. Planchon; but h he declined it 
arrangements to take over the business of a chemist at Hurstpier- 
point. This business he held until his death, assisted for many 
were sent . him for brine the last collection was return 
named in 1 
In 1851 Mitten commenced publishing, i r i Annals of Natural 
History, ‘A List of all the Mosses and Hepatice hitherto observed 
in Sussex,” but this was never completed. The same year he pub- 
lished his first contribution to the Moss-Flora of South Avnasiaie 
jer sas crowned, in 1869, by what may be termed his magnum 
“ Musei Austro- Americani,” which occupies the whole of 
the > twelfth volume (upwards of 650 pages) of the Journal of the 
ainnean Society. The basis of this was the very fine collection made 
by Richard Spruce ; about 1750 species, betoniail to 127 genera, 
are describ 
The Roy al Society's Catalogue of Scientific Papers, down to 1883, 
gives the titles of forty contributions by Mitten to various botanical 
publications, but this list is by no means exhaustive. For example, 
