Phillips and Praeger — The Ferns of Ulster. 15 



laznm. Castlereagh and Crossgar, Co. Down ; and Kilroot, Co. Antrim, 

 W. H. P. Dundonald and Cultra, Co. Down, R. LI. P. 



lineatum. Cultra, Co. Down, R. LI. P. Has not, so far, proved constant. 



multlfidum. Dundonald, Co. Down, R. LI. P. 



multilobum laxum. Castle Dobbs, Co. Antrim, R. LI. P. 



perserratum. Glenarm, Co. Antrim, R. LI. P. 



polydactylum. Glendevis, Co. Antrim, W. H. P. Stormont, Co. Down, 

 R. LI. P. 



proliferum. Following the classification of the leading pterodological authori- 

 ties, we arrange this difficult and beautiful class of varieties under two 

 heads — acutilobes and divisilobes. Mr. Wollaston thus characterises the 

 two subdivisions : — 



a. acutilobum. Tripinnate ; all divisions of frond acute, anterior and posterior 

 pinnules almost of same length. 



b. divisilobum. Tripinnate ; same as acutilobum, except tbat the anterior 

 and posterior pinnules are of very unequal length, the latter far longer, 

 and the divisions altogether more highly developed. A well-grown plant 

 is subquadripinnate or even quadripinnate. Our district has so far 

 yielded only a few of these beautiful varieties, but such as have been 

 found eminently maintain its reputation as a first-class hunting-ground. 



a. acutilobum. Castlereagh, Co. Down, W. H. P. Castle Dobbs, Co. An- 



trim, R. LI. P. 



b. divisilobum. Castlecoole, Co. Fermanagh, W. H. P. (divisilobum 



laxum, Jones). Characterized by Mr. Wollaston as " a gem of the first 

 water." 



divisilobum Crawfordise. (proliferum Crawfordianum of Stansfield). 

 Crawfordsburn, Co. Down, Miss Crawford. This is the celebrated Craw- 

 fordsburn Fern, one of the most beautiful of a beautiful class, which was 

 found near Crawfordsburn in 1861 by a labourer of Miss Crawford, only 

 a single plant being discovered at the time, and in spite of frequent search 

 it has never been found since. The plants usually sold as Crawfordsburn 

 Ferns in the market are a far commoner form, viz.— divisilobum Alchinii. 

 The genuine plant is found in very few collections ; it is easily recog- 

 nisable by tbe very broad and overlapping character of the pinnae, and 

 the extreme breadth of the fronds. 



quadratum. Co. Antrim, A. Stansfield, Moore's N.P. Ferns. 



retroflexum. Glenarm, Co. Antrim, R. LI. P. 



revolvens. Castleton, Co. Fermanagh, W. H. P. 



rotundatum. Ligoniel, Co. Antrim ; and Castlecoole, Co. Fermanagh, 

 W. H. P. Craigavad, Co. Down, R. LI. P. The first-mentioned is a 

 splendid rotundate form ; the others are not so distinct. 



rotundo-lnterruptum. Holy wood Hills, Co. Down, W. H. P. and R. LI. P. 



setosum. Castlereagh, Co. Down, W. H. P» Cultra, Co. Down, R. LI. P. 



