A. W. Evans — Arranc/ement of Genera of Hepaticae. 265 



best to retain the latter, in accordance with the views of most 

 authors. (See Carrington, Brit. Hep. p. 52.) 



6. Porella Dili. Hist. Muse. p. 459 (1741): Lindb. in Act. Soc. Sc. Fenn. ix. pp. 



329-.345 (1869). 

 Madotheca Duiu. Comm. bot. p. Ill (1822); Syll. Jung. p. J-lO; Rev. des Genres, 

 p. U: G. L. & N. Syn. Hep. p. 262. 



Cavendishia S. F. Gray, Nat. Arr. Br. PI. i, p. 689, not Cavendishia Lindl. 

 Bellincinia and Antoiria Raddi, Jung. Etr. in Mem. Moden. xviii, pp. 18, 19. 



A widely distributed genus of 75-100 species. The original 

 species is P. porella of Linnasus, which both he and Dillenius placed 

 among the Musci ; here it remained overlooked, until it was brought 

 to light by Lindberg. 



7. PleurOZia Dum. Rev. des Genres, p. 15 (1835); Hep. Eur. p. 52. 

 Radulae sp. Dura. Syll. Jung. p. 38. 



Physiotium JSTees, Eur. Leberm. iii, p. 75 (1838): G. L. & N. Syn. Hep. p. 234: 

 Jack, Hedwigia, xxv, p. 49. 



Jack enumerates 10 species in his monograph of the genus ; of 

 these one onl}^, P. cochleariformis, occurs in Europe, the others 

 being confined to Asia and the Pacific Islands. 



TRIBE II. PTILIDIE^. 



8. Ptilidium Nees, Eur. Leberm. i, p. 95 (1833): G. L. & N. Syn. Hep. p. 249. 

 Jungermannia, sect. Blepharozia Diim. Syll. Jung. p. 46 (1831). 

 Blepharozia Dura. Rev. des Genres, p. 16 (1835). 



A genus of about 8 species, the typical P. ciliare Nees being 

 widely distributed. 



9- TrichoCOlea Dum. Comm. bot. p. 113 (1822); Syll. .Jung. p. 66; Rev. des 

 Genres, p. 20; Hep. Eur. p. Ill: G. L. & N. Syn. Hep. p. 236. 



A small but widely distributed genus of Avhich the tj'pe is T. 

 tomentella Dum, 



The name of the genus was first published by Dumortier in his 

 Commentationes as " Thricolea,'''' which spelling he retained in his 

 Sylloge. Nees von Esenbeck corrected the spelling to " Trichocolea " 

 (Eur. Leberm. iii, ja. 105) ; but Dumortiei', objecting to the sound of 

 this name, shortened it into " Tricholea " both in his Revision des 

 Genres and in his Hepaticae Europ^e. As, however, the name " Tri- 

 chocolea " is preserved by most authors, it has been retained here. 



10. Leiomitra Lindb. in Act. Soc. Sc. Fenn. x, 515 (1875). 



Lindberg gives 2 species, — L. tonientosa of tropical America and 

 L. capillata of the Philippine Islands ; several additional species are 

 described by Spruce. 



