Evans: Hepaticae of Puerto Rico 169 



and Para, * and Spruce has also reported A. Cruegeri from the 

 latter locality, f Stephani's report is based on two specimens in the 

 Lindenberg herbarium, one doubtfully referred to Lejcunea unci- 

 loba Lindenb. and the other representing a portion of the original 

 material of L. cyclostipa Tayl. The writer has examined both of 

 these specimens and would refer the first to L. {Arc hi- Lejcunea) 

 florentissima Spruce rather than to A. Auberiana ; % the second is 

 unfortunately so fragmentary that positive determination is hardly 

 possible. With regard to A. Cruegeri the type material itself is 

 scanty and poorly developed, making it difficult to obtain an ade- 

 quate idea of the species. In view of these facts confirmatory 

 evidence as to the occurrence of A. Auberiana and A. Cruegeri in 

 South America is much to be desired. Although Archilejeunea 

 has not yet been reported from Puerto Rico, a single species, also 

 belonging to the subgenus DibracJiiella, has been found on the 

 island, namely : 



Archilejeunea viridissima (Lindenb.) 



Lejeunea viridissima Lindenb. in G. L. & N. Syn. Hep. 320. 



1845. 

 Lejcunea (Archi- Lejcunea) viridissima Steph. Hedwigia 29: 17. 



1890. 



Yellowish- or brownish-green, becoming darker with age, 

 neither glossy nor glaucous, growing in depressed mats : caudex 

 and secondary stems about 0.14 m m - in diameter, the latter simple 

 or sparingly subdivided, often with poorly developed lobules: 

 leaves imbricated, the lobe widely spreading, slightly falcate, broadly 

 ovate, 0.75 mm. long, 0.6 mm. wide, convex, and sometimes revo- 

 lute at the broad and rounded apex and along the postical margin, 

 antical margin straight or a little rounded at the base, then strongly 

 outwardly curved to the apex ; lobule (when well developed) ovate, 

 0.35 mm. long, 0.25 mm. wide,the water-sac broad at the base 

 and abruptly narrowed in the outer part, free margin sometimes 

 revolute at the base, sometimes appressed to the lobe from base 

 to apex, rounded, normally bearing two teeth in the outer part, 

 the outer or apical a little longer than the other and often variously 

 curved, the inner varying from acute to obtus e and sometimes 



* Hedwigia 29 : 15, 21. 1890. 

 t Hep. Amaz. et And. 97. 1884. 

 % See Torreya 7 : 228. 1908. 



