390 CRYPTOGAMIA — FILTCES. IHijmenophi/Uum. 



bate, segments of the fertile pinnules terminated by a linear- 

 oblong sorus, sterile ones serrated. J5. Bot. t. 320. 



Moist rocks and walls, especially near the sea; rare. Near St Ives. 

 Barr}' island and Port Kirig, Glamorgan. South isles of Arran, Gal- 

 way, Ireland. Between Douglas and Peel, Isle of Man, Mr Clark. 

 By the Carron, Kincardineshire. — A most delicate and graceful Fern, 

 very abundant in the south of Europe, where I have seen it lining the 

 inside of wells with a tapestry of the tenderest green. 



12. Trichomanes. Limi. Bristle-fern. 



I. T. brevisetum, Br. (short-styled Bristle-fern); fronds 3 — 4- 

 pinnatifid glabrous, segments linear entire or bifid obtuse, invo- 

 lucres solitary in the axils of the upper segments margined 

 cylindrical, the mouth scarcely 2-lipped shorter than the recep- 

 tacle. — T. Europamm, Sm. in Rees Cyct. — T. alatum, Hook, in 

 FL Lond. N. S. t. 33, (not Willd.) — T. pyxidifertim, Huds. — 

 HymenophyUum alatum, E. Bot. t. 1417. — Hymejiophyllurn Tun- 

 bridgense, (3. Fl. Brit. 



Wet rocks in mountainous countries, rare. Near Bingley, Yorkshire. 

 Powerscourt, and near the cascade at the foot of Turk mountain, Kil- 

 larney. Hermitage Glen, Wicklow. — This rare and beautiful Fern, to- 

 gether with the species of the following genus, have a habit very differ- 

 ent from the rest of our Ferns and belong to a group which abounds in 

 the tropics. T\iQ\v fronds are membranous and elegantly reticulated ; 

 and their depressed sessile capsules have jointed rings which completely 

 surround them transversely, and they are fixed at a distance from the 

 ring to the receptacle. 



13. HyMENOPfiYLLUM. Sm. Filmy-fern. 



1. H. Tunbridgense, Sm. {Timbridge Filmy-fern); fronds 

 tender pinnate, pinnae distichous vertical pinnatifid the segments 

 linear undivided or bifid and as well as the axillary solitary 

 suborbicular compressed involucre spinuloso-serrate, rachis 

 strongly winged. E. Bot. t. 162. 



Moist rocks among moss, in mountainous countries. First found at 

 Tunbridge. Abundant in the north-west of England and in Wales and 

 many parts of Ireland. Banks of the Clyde. — Habit tender and deli- 

 cate. PinncB pointing in two opposite directions, flat and vertical, on 

 the same plane with the winged rachis. Involucres nearly orbicular, 

 slightly swollen at the base, where the cluster of capsules is lodged, the 

 rest compressed, especially at the margin of the valves. When dry, 

 there is a degree of elasticity in the plant. 



2. H. Wils6?ii, Hook. (Scottish Filmy-ferti); fronds rigid pin- 

 nate, pinnae rpcurved subunilateral wedge-shaped and 4 — 6-lobed, 

 the segments linear undivided or bifid spinuloso-serrate, invo- 

 lucres axillary solitary ovate inflated entire, rachis only slightly 

 margined towards the extremity. Wils. in E. Bot. Suppl. 



t. 2686. 



Wet rocks. North of England and Wales. Abundant in the High- 

 lands of Scotland and in many parts of Ireland. High granite rock, 

 near Bodmin, Cornwall, Miss Rodd. — More rigid, and with larger re- 



