Wheldon : The North of England Harpidia. 



69 



Forma gracilescens Ren. (ff. adiuicum var. gracilescens 

 Schimp.). Stem erect, shorter (5-8 cm.). Leaves shorter, from 

 a more dilated base, suddenly narrowed to a short acumen, 

 often undulate or folded at its base. Nerved about half-way. 

 Basal sinus somewhat wide and shallow. 



8. Ropsley (53), S. C. Stow ! 



9. St. Anne's (60), Wheldon ! ! Ainsdale (59), W. Wilson ! 

 10. Clifton Ings (62), Ingham (teste Dixon). Coatham 



Marshes (62)-, Ingham ! 



Sometimes the auricular cells in this and var. falcatum 

 become yellow and incrassate when growing in maritime situa- 

 tions, and are then liable to be mistaken for an analogous form 

 of H. Sendlneri, the \*ar. gracilescens Schimp., but the latter may 

 be distinguished by its firmer texture and stouter nerve. 



Forma tenuis Ren. (var. tenne Schimp. ?). In dense, 

 depressed, yellowish tufts, intricately branched, more or less 

 pinnate. Leaves very small, from an oval base rapidly con- 

 tracted to a short recurved point. Nerve very short, sometimes 

 rudimentary. Probably a starved form of the preceding. 



9. Southport (59), Holt (Braithw. Moss Fl.). 

 10. [Knottingley (63), W. Ingham.] 



Var. aquaticum Sanio. Stouter and more robust than any 

 of the preceding, usually submerged, in large yellowish-green 

 tufts. Stems 10-15 cm. Leaves larger (3^ to 4 mm.), more 

 distant, falcate secund, with a long spreading, flexuose, gradually 

 attenuated acumen. Nerve wider, ceasing in the base of the 

 acumen. Cells long'er, the basal ones sometimes opaque. 



9. Southport, and near Hightown (59), W'heldon ! ! Catforth 

 (60), H. Beesley. Birkdale (59), W. W T ilson ! (ex herb. E. C. 

 Horrell). 



10. Brick-pond near Bedale (65), Wheldon ! 



Var. diversifolia Ren. MS. Somewhat rigid, regularly 

 pinnate, 6-10 cm. high. Leaves markedly dimorphous, those of 

 the stem, from an ovate-lanceolate base prolonged into a long 

 slender acumen, erect secund, subfalcate at the apex ; those of 

 the branches much smaller, more suddenly acuminate, falcate- 

 secund. Auricular cells frequently with thickened walls, less 

 hyaline, especially in maritime situations. 



9. West Kirby (58), Wheldon ! Ainsdale, and to the North 

 of Southport (59), Wheldon ! Between Lytham and St. Anne's 

 (60), Wheldon ! ! 



10. Coatham Marshes (62), Ingham ! ! Selby (61), Ingham!! 



1902 March 3. 



