72 HEPATIC J^. 



Lawers, George E. Davies. Mael Tarmachan near Ben Lawers, 

 C. J. Wild, G. A. Holt. Ben Cruaclian, Loch Awe ; Ben Laoigh, 

 Craig Calleach, 2\ Rogers. 



Found on the Continent (Germany, Switzerland, Austria). 



Obs. — Differs from R. comjdanata (L.) in its dioicous 

 inflorescence ; from R. aquilegia, Tayl., in its pale yellowish-green 

 colour, the leaves not being so tumid at the base, and the perianth 

 being longer and narrower; from R. Lindbergii, G. {R. com- 

 mutata, G.) in its paler colour, narrower stems (with leaves), 

 more erect leaves with smaller cells, and lons^er and narrower 

 perianth. 



Some authorities consider this species to be only a variety of 

 the latter, but the characters indicated induce me to follow Jack 

 in raising it to the rank of a separate species. 



Description op Plate XXIII. —Fig. 1. Plants natural size. 

 2. Portion of stem, antical view x 24 (Mael Tarmachan, G. A. 

 Holt). 3. Ditto, ? postical view x 16 (ditto). 4. Leaf x 24 

 (Germany, Jack). 5. Portion of leaf x 290 (Mael Tarmachan, 

 G. A. Holt). 6. Perianth and bracts x 24 (Germany, Jack). 7. 

 Perigonial bracts x 31 (Ben Cruachan, T. Eogers). 



4. Radula Holtii, Spruce. 



Radula Holtii, Spruce in '' Journ. of Bot." (July 1887). 



Dioicous, creeping, small, rufulous or olive green. Stems 

 slender, fragile, branches subpinnate or dichotomous. Leaves 

 contiguous or subdissitous, at the base decurrent, complicato- 

 saccate, keel at an angle of 45°, suberect, ascending, convex, 

 abruptly widely patent, antical lobe broadly oblong, rotundate, 

 plane or subconcave, repand, much incurrent, not hiding the stem 

 at the basal angle, postical lobe one-third the length, trapeziform, 

 obtuse or subacute, subplane, inflated at the keel only, running 

 well in upon the stem but not passing over (or across) it ; cells 

 small, 4-, 5- and 6-angled, opaque or sub-pellucid, walls thick, 

 angles but slightly thickened, without trigones. Flowers terminal, 

 innovations unilateral or two opposite. Bracts often only one 



