SUB-SECTION LASTREA. 143 
19. laciniatum, Lowe (laciniato-truncatum, Barnes). Found in 
Patterdale by Mr. W. Foster. A laciniate, truncate form. 
20. lineatum, Lowe (lineatum-furcans, Bar?ies). Found in Patter- 
dale by Mr. W. Foster. 
21. morsum, Lowe (erosa-Barnesii, Moore). Found in S win- 
dale by Mr. J. M. Barnes. A delicate variety, with evenly reduced 
pinnules. 
22. multifidum, Barnes. Found in Mardale by Mr. T. Airey. A 
small-growing, multifid form. 
23. multiforme, Moore. Found in Long Sleddale by Mr. J. M. 
Barnes. Fronds variable and very irregular. 
24. nanum-cristatum, Jones (cristato-nanum, Sim). A dwarf, 
narrow-crested form. 
25. productum, Foster. Found in 1887 or 1888 by Mr. Foster. 
When fully developed, this is a very fine, slender fern. The lower 
pinnules are long and much divided. 
26. pulchellum, Stansjield. Found in Patterdale by Mr. W. 
Foster. 
27. Smithiesii, Barnes (crispata-incisa, Jones). A distinct, inter- 
esting fern. Found by Mr. Smithies. Pinnules finely cut and 
crisped. 
28. strictum, Moore. Found in Mardale by Mr. J. M. Barnes. 
Distinct. Pinnules much reduced. 
THE CRESTED BUCKLER FERN. 
N EPHRODIUM CRISTATUM.— MichaUX. 
(Lastrea cristata. — Brest.) 
Fig. 41.— Nephrodiura cristatum, pinna (showing fructification). 
A RARE and local fern, growing only in boggy localities. It 
has been found near Ipswich, Lynn, Dersingham, Holt, Yarmouth, 
Norwich, Wymondham, Newcastle-under-Lyne, Oxton Bogs, 
Bulwell Marshes (not now), Wybunbury Bog, Knaresborough, and 
Malton. It is also a native of France, Germany, Italy, Switzerland, 
Russia, Belgium, Holland, Scandinavia, Siberia, Canada, and the 
United States. 
Fronds from 1 to 3 feet, of which one-third is the stipes. Erect 
in growth. Narrow, linear-oblong, sub-bipinnate, tapering to the 
apex. Lower pinnte distant. Sori large and conspicuous. Deci- 
