464 HEPATIC^. 



Perthshire, G. A. Holt, S. M. Macokar. 16. Common, Moidart, 

 West Inverness, S. M. Macvicar. 



I. Killarne}^ Glena, Tore Cascade, O'Sullivan's Cascade, 

 Prof. S. 0. Liiidherg ; Killarney, fertile Sept. 1897, McArdle ^^ 

 Lett; Eoss Island,' fertile May 1899, McArdle §' Lett; Hill of 

 Howth, B. McArdle. 



Europe, Asia, North and South America, &c. 



Obs. — This large and beautiful species is in addition to other 

 characters, easily distinguished from M. f areata and M. hamata 

 by its monoicous inflorescence, the male and female flowers being 

 interspersed on the midrib of the same frond. 



Description of Plate CCVII. — Fig. 1. Plant natural size 

 (Hooker). 2. Portion of fertile frond, postical view x 13 

 (Schiffiier in Engl, und Prantl, Pflanzenf.). 3. Portion of 

 frond X 60 (Elfving). 4. Cross-section of frond x 60 (ditto). 

 5. Female involucre, seen I'rom above, with a group of pistillidia 

 X 37 (Schifiner in Engl, und Prantl, Pflanzenf.). 6. Portion of 

 midrib with $ flowers x 27, the upper one partly opened, showing 

 the antheridia (ditto). 



4. Metzgeria hamata^ Liiidb. 



2letzgeria hamata, Lindb. Soc. F. Fl. Fenn. (1874). 

 Jung ermania f areata, var. B. elongata, Hook. Brit. Jung. (1813-16). 

 Metzgeria linearis (non Aust.), Lindb. in Act. Soc. sc. Fenn. 10, p. 494, n. 26, 

 excl. synon. Sw. (1875). 



Dioicous ; stratificato-csespitose ; medium to largish size, yellow 

 or pale yellowish-green in colour, pellucid, when dry shining. 

 Fronds prostrate, dichotomous, branches long, linear, of equal 

 breadth, very convex, margins reflexed not undulate, apex obtuse, 

 antical surface smooth, postical surface densely setose-pilose 

 on the midrib, wings without hairs, except at the margin ; hairs 

 very long, divaricate, hooked-deflexed ; midrib same colour, 

 prominent on the postical side, also slightly so on the antical, 

 about 20 cells in circumference ; texture delicate, cells larg-e, 

 regularly 5- and 6-angled. Female flowers produced on the 



