298 Proceedings of the Royal Irish Academy. 



Rah. In damp, shaded places, among mosses and the larger 

 Hepaticse. Hickson's "Wood, D. McA,, 1894; Connor hill, and 

 on the west side of Mount Brandon, F. W. JVT. and D. McA,, July, 

 1881 ; Maghanaho glen, D. McA., 1875 ; Lough Duff, Lett and 

 McA., May, 1899 ; Derrymore glen, Lett andMcA., May, 1899 ; 

 rare. 

 6. Lejeunea HoUii, Spruce, Journal of Botany, vol. 25, p. 33, pi. 

 272, 1887. 



Hab. On wet rocks in shaded places, among mosses and the 

 larger Hepaticse. In the crevices of rocks among Fissidens 

 taxifolius, Loughanscaul, D.McA., May, 1894, Mount Eagle 

 lake, Lett and McA., Septr., 1898; shores of Barnanaghea 

 lough, Lett and McA., Septr., 1898 ; Lough IS'alachan, 

 Mount Brandon, Lett and McA., May, 1899. This rare 

 Lejeunea, which had hitherto been only known to grow at 

 Killarney, differs from every other Lejeunea in the female 

 flowers, being borne on exceedingly short branchlets, which 

 normally put forth no sub-floral innovations, such as constantly 

 exists in all our other species. In size it resembles L. flava, or 

 luxuriant serpylHfolia, but usually differs at sight from both by 

 the pale, reddish tinge of the foliage. Even where the leaves 

 are of the yellow-green of almost ripe limes, dried specimens 

 speedily assume a rufus hue when moistened. Another im- 

 portant and unique character is afforded by the large pear- 

 shaped perianths being so very strongly and sharply keeled 

 that at first sight they seem broadly five-winged. The female 

 flowers often alternate, or are variously mixed up with male 

 catkins of about the length of the adjacent leaf, and consisting 

 of from two to five pairs of cymbif orm bracts. Where inflores- 

 cences of both sexes are numerous they render the stem or 

 branch elegantly pinnulate. The only species which L. Holtii 

 might be confoimded with is L. flava, which grows near it. 

 Although nearly equal in size is far more delicate and pellucid, 

 and its usual slight tinge of red is never seen in the yellow or 

 green foliage of L. flava. The latter, besides the essential 

 difference of the perianths being terminal on branches of various 

 lengths, or on the main stem, and invariably putting forth from 

 their base a leafy innovation, or even a pair of opposite innova- 

 tions, each of which may in like manner bear an apical flower, 

 subtended by a secondary innovation, differs also in the tufted 

 habit, the imbricated leaves (which, although only slightly 



