SPECIES AND VARIETIES OF BRITISH FERNS. 5i 



0. P. annulare, Presl — Fronds bipinnate, lax, pinnules 



oblong or ovate-subfalcate, auricled, bluntish or acute, 

 obtusely angled at the base, stalked. Plate V. fig. 2. 



«ar. subtripinnatum. — Fronds ample; lower pinnules 

 large, and again pinnate, otherwise normal. 



var. proliferum. — Fronds bearing bulbils ; pinnules 

 narrow, acute, deeply pinnatifid, with distant atte- 

 nuate lobes. 



va7'. imbricatum. — Fronds very narrow ; pinnules ob- 

 long-obtuse, overlapping. 



var. alatum. — Fronds normal in outline ; pinnules con- 

 nected by a broad wing of the rachis, which obliter- 

 ates the stalk. 



var. cristatum. — Fronds and pinna; tassellcd at their 

 extremities. 



Genm 5. LASTREA, Presl. 



1. L. Thelypteris, Presl. — Fronds pinnate, not glandular ; 



sori submarginal, on more or less contracted fronds ; 

 caudex creeping. Plate VI. fig. 1. 



2. L. montana, Moore. — Fronds pinnate, covered with 



sessile glands ; caudex tufted. Plate VII. 



