WILSON’S OBSERVATIONS, 317 
1829. This is well described. The receptacle does certainly 
when the fructification is much advanced project, often above 
four times the length of the cover, and often bearing cap- 
sules throughout its whole length; and this extension of the 
receptacle is gradual. The young fructification appears in 
November and December, at which time the receptacle is 
included within the involucre. 
18. Hymenophyllum Tunbridgense. Near Killarney, August 
1, 1829. Covers, as described, sharply toothed, compressed, 
valves dilated upwards. Seeds aggregate, in fours, the stalk 
of the fructification winged. Pinna rhomboidal, truly pinna- 
tifid, with 8 or 10 segments, very much toothed at the apex 
and their nerve discontinued. Frond complanate, of a glassy 
appearance. 
The-texture is more delicate, and the reticulation smaller 
considerably than in the next species, and it is not, like it, 
liable to curl up in drying. It grows to a larger size, and is 
often very broad, approaching to a lanceolate figure, and 
With a stalk of considerable length. I have specimens six 
inches in length. 
19. Hymenophyllum Wilsoni. Near Killarney, August, 
1829. Frond oblong, with a very short stalk compared with 
the other species. Pinnæ not properly pinnatifid but wedge- 
Shaped, abrupt, widest at the top with four or five erect or 
ascending, simple or forked segments, (seldom any more) 
obliquely disposed in reference to the rachis, the segments 
are less toothed at the apex than elsewhere and their nerve 
iS not discontinued. Cover entire, the valves very prominent 
at the back, ovate. It is supported on a stalk bent upwards 
and not very evidently winged. Seeds disposed, as im the 
other species, four together, surrounded by a pellucid cover-. 
ing, 
The reticulation of the frond is much coarser in this 
Species, it curls very much in drying. 
20. Equisetum variegatum, var. Mucruss, near Killarney, 
December 9, 1829. In a wet ditch. Stem mostly simple, 
two feet high or more, with ten principal furrows and ten 
