288 Evans: Hepaticae of Puerto Rico 



mixed with the specimens distributed as Lcjcnnea ceratantlia. It 

 has not been reported from any other localities. 



Reference has already been made to this species in the discus- 

 sion of the genus Harpalejennea.'^ Unfortunately the specimens 

 preserved as the type do not agree in all respects with the origi- 

 nal description, the most important discrepancy being with regard 

 to the perianth, which is said to be five-keeled at the apex. The 

 single perianth studied by the writer is in the Hampe herbarium 

 and is mounted on mica, so that it was apparently seen by the 

 authors of the species. This perianth, as shown by figure 21, has 

 four blunt horns, and it would therefore appear that the original 

 description is incorrect in attributing to the plant a five-keeled 

 perianth. Stephanif has described a specimen of this species, also 

 presumably a part of the type, which differs somewhat from the 

 normal form. This specimen is said to have distant leaves with 

 the lobe squarrose, ovate -lanceolate, and sharply pointed. A 

 drawing of this peculiar plant, which he has kindly supplied, shows 

 these differences clearly but agrees with the specimens described 

 above in its lobules and nnderleaves. Whether it represents an 

 admixture of another species or is simply a slender and poorly de- 

 veloped form of C. patentissima can hardly be determined. 



C. patentissima is the smallest form of the genus known from 

 Puerto Rico. The slender lobule, distinctly curved forward in the 

 outer part, is perhaps its most striking feature. At the junction 

 with the lobule the postical margin of the lobe curves abruptly 

 inward, the consequence being that the outer end of the water-sac, 

 enclosing the tubular canal, seems to be entirely free from the lobe 

 (figure 19), The true conditions can be made out only by dis- 

 section. The lobule apparently exhibits no modifications, neither 

 spherical lobules nor utriculi having been observed. Aside from 

 the peculiarities in the lobule, the species is remarkable for its 

 squarrose and strongly falcate lobes, for the lack of teeth on its 

 leaves and bracts and for its small orbicular underleaves. The 

 walls of the leaf-cells, also, are unusual on account of their minute 

 pits, many of the cells being apparently thick -walled throughout 

 (figure 22). 



* Bull. Torrey Club 30 : 547. 1903. 

 tHedwigia 27: 288. 1888. 



