ADDENDA TO PART SECOND. 



Page 36, after Fontinalis antipyretica, insert — ■ 

 It is not intended that the leaves are never complicato-carinate, but 

 that this often occurs only in appearance. 



Page 55, after Targionin hypophylla, insert— 

 The loculus situated beneath the top of the frond, is subcom- 

 pressed, and opens downwards. The seeds are in quaternions. 



Page 59, after Jungermannia Orcadensis, insert — 

 I have lately observed the presence of stiptiles : these are minute, 

 ovate, purplish, anteriorly ciliate ; the cilia sometimes radicating. 



Page 61, after Jungermannia nemorosa, insert — 

 A variety occurs on the summit of Brandon, County of Kerry, grow- 

 ing through tufts of Hypnum loreum, and accompanied by Jung. Or- 

 cadensis and Jung, ciliaris ; with the stems elongated, the leaves of 

 nearly an equal size and evenly set on the stem from top to bottom, 

 the inferior lobe subacute ; the upper scarcely attached to the lower, a 

 part embracing the stem, the rest subsquarrose ; both lobes rather dis- 

 tantly ciliate, the cilia few, elongate ; the colour of the plant a reddish- 

 brown. This will probably prove a distinct species, when we are ac- 

 quainted with its fructification. 



Page 91, before Verrucaria plumbea, insert — 

 Verrucaria lucens. Thallus tartareous, thin, purplish- 

 brown or mouse-coloured, minutely cracked, black-edged. 

 Apothecia sessile, very prominent, black, shining, conieo-hemis- 

 pherical, with a pore on the summit, numerous, rather evenly- 

 scattered. 



On siliceous slate, side of Lough Finnehy, County of Kerry ; May 

 1836. The thallus spreads usually some inches in diameter ; its 

 colour reminds one of V. plumbea ; it is little altered by the applica- 

 tion of moisture ; the surface of aged portions sometimes turns greyish- 

 brown ; the black limit is very general, and always to be seen round 

 young portions of thallus. The prominent, black, shining, almost 

 glistening apothecia give our plant a beautiful and peculiar character. 

 These are sometimes clustered into threes or fours ; commonly, how- 

 ever, they are pretty evenly scattered, very visible to the naked eye, 

 but their pore is discoverable only with the assistance of a lens. The 

 perithecium is double ; the exterior hard, thick, and black, deficient 



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