114 ‘BRITISH FERNS. 
specimens from which the preceding description was 
taken: in 1859, Mr. Frederic Clowes, of Windermere, 
found the same fern in his own neighbourhood, and 
thus added a species to our list of British Ferns. It 
has not been observed elsewhere in Great Britain or 
Ireland. Iam indebted to Mr. Clowes for the oppor- 
tunity of examining Windermere specimens, which I 
have carefully compared with those received from 
Professor Braun, and believe them identical. 
In cultivation it may be treated like Spinosum; 
planted in peat-earth in an open border; or, if ina 
green-house, good ventilation as well as drainage 
should be secured. 
27. RIGID FERN. Ricwwum. 
Aspidium rigidum, Schkuhr. B. F. 175, 180. 
The caudex is large and tufted; the stalk is un- 
usually thick at the base, and very thickly- clothed 
with large, pale red, concolorous scales, which are 
present, although less abundant, throughout its entire 
length ; the proportion of the stalk to the leafy part of 
the frond varies between a fourth and a half; the 
frond is nearly erect, the leafy Part lance-shaped and 
