ADDENDA. 347 
their posterior pinnules enlarged, and quite pinnate at the base, deeply pin- 
natifid upwards; hence acquiring something of the outline and character 
of Lastrea dilatata. It was found near Nettlecombe, Somersetshire, by Mr. 
Elworthy. 
16.** pyramidale (M.). A distinct-looking form, with the base of the frond broadest, 
giving it a pyramidal or elongately-triangular outline. The fronds are upwards 
of a foot long, exclusive of the stipes. The pinne are dense, the basal ones 
five inches long, the next pair about an inch shorter. The pinnules are evi- 
dently stalked, oblique, the basal ones deeply pinnatifid, with ovate toothed 
lobes ; the upper part of the pinnules is biserrate, and the teeth acute, but not 
prominently aristate. It has been recently found by Mr. Elworthy at Nettle- 
combe, Somersetshire. . 
18. trapezoideum (M.). Devonshire : Barnstaple (larger, lax, with blunt pinnules) 
H. F. Dempster ; Ottery St. Mary, G. B. Wollaston. Antrim, A. Stansfield. 
18.* reflexum (Woll.). This somewhat resembles small states of trapezoideum (18) and 
intermedium (17) but the upper surface of the pinnules is convex, from the 
edges being constantly reflexed. It was found at Ottery St. Mary, Devonshire, 
by Mr. Wollaston. 
18.** elegans (Woll.). A dwarf and elegant form, most remarkable in the more 
advanced fronds we have seen for the distinct acuminate teeth. The basal 
anterior pinnules are much the largest, and almost pinnate. It has fronds, 
however, which produce somewhat wedge-shaped pinnules, and the lobes of 
these are separated by acute open sinuses producing a biserrated appearance, 
which along with the large prominent spiny teeth give it a distinct aspect. 
It was found by Mr. Wollaston, near Worthing, Sussex. 
18.*** calcaratum (M.). A dwarf interrupted form, in which the small pinnules 
where perfectly formed are remarkable for their long coarse conspicuous spiny 
serratures, In the upper part, the pinne become irregularly abbreviated, and 
the pinnules irregularly depauperated, the main rachis being also arrested and 
developed in the form of a small horn or spur amongst the misshapen pinne. 
It was found in Devonshire, by Mr. Wollaston. 
21. grandidens (M.). The fronds of this variety, one form of which is sometimes 
known as Baileyanum, have the pinnules sometimes variously inciso-laciniate, 
or with a few large angular teeth. The rachis is occasionally developed into a 
horn or hook, and it has thence sometimes been called cornutum. Very ele- 
gant narrow-fronded forms have been found in Yorkshire near Whitby, by 
Mr. W. Willison, and in Somersetshire, near Weston-super-Mare, by Mr. H. 
Parker. 
26. præmorsum (Alleh.) Mr. Elworthy has recently found near Nettlecombe, two 
forms closely allied to this variety. 
26.* pramorso-pulchrum (M.). This is intermediate in character between premorsum 
(26) and pulchrum (19). It has small fronds and small pinnules which latter 
in the lower part of the frond are inciso-lobate with serrated lobes, whilst in 
the upper part they are more or less decurrent and misshapen, forming 
irregular more or less confluent pinne. It was found at Nettlecombe by Mr. 
Elworthy. à 
26.** pumilum (M.). This is smaller than the foregoing, but somewhat resembles 
preemorsum (26), the pinnules being more or less confluent but more regular 
than in that variety, and standing back so as to appear almost recurved. In 

