HYMENOPHYLLUM. 41 



and rounded into deep-cut, oblong, alter- 

 nate, scallops on each side, fringed at first 

 with white on their edges ; the under sur- 

 face whitish also, intermixed with brown, 

 but shortly becoming coloured like rusty 

 iron ; clothed with chaffy scales concealing 

 the sori. End of April. Evergreen. Com- 

 mon on walls, especially in the West. Suc- 

 ceeds well. Likes watering, but shrivels 

 under excessive heat, sunshine, and frost. 



HYMENOPHYLLUM. 



Sori contained in little two-valved vessels, 

 springing from the pinnae, and adjoining 

 the stem. No Indusium. 



HYMENOPHYLLUM TUNBRIDGENSE. (Tunbridge 

 Filmy Fern.} Fig. 38. From 1 to 3 inches. 

 Hoot creeping, with minute, twisted, and 

 entangled, fibres. Growing up therefrom 

 irregularly, but not far asunder. Dark 

 green. Stem very slight and hair-like ; 

 and from the pinnae upwards bordered by a 

 skinny, clouded, margin. The tiny mostly 

 alternate pinnae are forked into separate, 

 simple, semi-transparent, networked, undi- 

 vided, prickly, lines, occasionally, however, 

 split at their apex, and nearly resembling in 

 appearance of texture some kinds of sea- 



