—29— 



hepatics. Here are the type stations for certain of the rarer species, which 

 occur nowhere else on the Island. Here too, some of the commoner species 

 grow in abundance and in a variety of habitats and show considerable variation 

 in consequence, as the following synonyms show: 



PiLOTRiCHELLA FLEXiLis (Sw.) Jaeg. Adumb. 162. 1875-76. 



Hypnum flexile Sw. Prod. fl. Ind. occ. 140. 1788. 



Leskea flexilis Hedw. Spec. Muse. 234 t. 58. 1801. 



Meteorium flexilis Mitt. Musci Austro am. 438. 1869. 



Neckera cochlearifolia C. M. Syn. Muse. 2: 130. 1851. 



Neckera turgescens C. M. Syn. Muse. 2: 131. 1851. 



Pilotrichella eroso-mucronata C. M. Bull. Hb. Boiss. 5: 563. 1897. 



Pilotrichella recurvo-mucronata C. M. Bull. Hb. Boiss. 5: 563. 1897. 



Type locality: Jamaica. 



Habitat: Common, pendent from branches of trees or creeping up stems of 

 bushes, rare in fruit. 



Distribution: W. I.: Jamaica, Cuba, Haiti, Porto Rico, Guadeloupe; C. A.: 

 Mexico, Panama and Taboga, Guatemala, Nicaragua, Costa Rica; S. A.: Brazil, 

 New Granada, Quito and Bolivia. 



Mr. Williams and I have arrived at the following conclusions: that the 

 smallest and most depauperate form of the species occurs in Mexico and has 

 been called P. cochlearifolia (C. M.) Besch., and the stoutest and most robust 

 form occurs in Jamaica and Mexico and Quito and New Granada and was de- 

 scribed as Neckera turgescens and P. flexilis var. robusta. Of the last two of 

 Miiller's names published in 1897, P. eroso-mucronata is from the type regions of 

 P. flexilis and the other P. recurvo-mucronata is not specifically distinct. Mon- 

 sieur Cardot has arrived at only part of the truth when he states* that he cannot 

 separate P. turgescens from flexilis var. robusta Broth, and P. recurvo-mucro- 

 nata (C. M.) 



New York Botanical Garden. 



FURTHER NOTES ON THE NORTH AMERICAN DISTRIBUTION 

 OF THE GENUS USNEA 



R. Heber Howe, Jr. 



Since the publication (Bull. Torn Bot. Club, 37: 1-18. 1910) of my paper 

 on the genus Usnea, certain specimens have come before me, some of which I 

 was unable to see before, and others in recently published exsiccati. It seems 

 worth while to publish, therefore, these additional notes, and bring in this way 

 my former paper up to date. 



Usnea florida (L.) Web. Mr. G. K. Merrill has distributed in his Lichenes 

 Exsiccati No. 133 material collected at Sanford, Florida, which he calls "inter- 

 mediate with the forma strigosa Ach. " In my paper on page 4, I included this 

 variety under the contingent phase (d), with the remark; "This phase is most 



*Rev. Bryol. 38; 102. 1911. 



