308 Alexander W. Evans, 



forty. The leaf-cells differ but little in size in the two species, but 

 the thickenings in the wall are much more pronounced in P. oresi- 

 tropha ; the trigones have bulging sides and are often elongated at the 

 angles, there are numerous intermediate thickenings (sometimes two 

 on a long lateral wall), and there is more or less coalescence between 

 the thickenings. In P. Footei, as noted in the description, the trigones 

 have concave sides, and it maj^ be added that intermediate thickenings 

 are practically lacking and that coalescence apparently never occurs. 

 In P. mapiriensis, known to the writer from description only, the 

 leaves are relatively longer than in P. Footei, measuring about 2.5 mm. 

 in length and only 1.1—1.4 mm, in width, and the cells are smaller, 

 averaging only 29 // in diameter ; in other respects the two species 

 seem to be closely allied, the number of marginal teeth in P. mapirien- 

 sis varying from eight to fifteen. 



10. Plagiochila Guilleminiana Mont. 



PlagiochilaGuilleminiana Mont.; Lindenberg, Monogr. Hepat. Gen. 

 Plagiochilae 152. pi. 33, /. 1-4. 1842. 



Plagiochila Haeckeriana Lindenb. & Gottsche ; G. L. & N. Syn. Hep. 

 644. 1847. 



Plagiochila oreocharis Spruce, Hep. Amaz. et And. 498. 1884. 



Plagiochila rhizophila Spruce, I. c. 495. 1884. 



On live wood, Santa Ana, 3,000 feet, August 4, 1911. 



The synonymy given above is taken from Stephani's Species Hepa- 

 ticarum.^ Accepted in this broad sense the species is variable and 

 has a wide distribution. It was based on two Brazilian specimens, 

 one collected by Raddi and the other by Guillemin, and was soon 

 afterwards reported from Mexico in the collections of Liebmann. 

 The type-locality of P. Haeckeriana is not given definitely by its 

 authors but was apparently somewhere in the Andes, while P. oreo- 

 charis and P. rhizophila were based on material collected by Spruce, 

 the first in Peru and the second in Ecuador. According to Stephani 

 P. Guilleminiana has been found also in Guatemala by Wurr and in 

 Colombia by Lindig. 



In the present specimens the stems are about 6 cm. long and are 

 simply pinnate, the branches being few and irregular and apparently 

 all of the Frullania type.^ The female inflorescences are borne on 

 the tips of some of these branches. The leaves (Fig. 4) have a length 



1 Bull, de I'Herb. Boissier II. 5 ; 356. 1905. 



2 See Evans, Ann. Bot. 26 : 4. 1912. 



