298 Alexander W. Evans, 



SPECIAL PART 

 MARCHANTIACEAE 



T. PLagiochsisma Lehm. & Lindenb. 

 1. Plagiochasma chlorocarpum (Nees & Mont.) ]\Iont. 



Reboulia chlorocarpa Nees & Mont. Ann. des Sc. Nat. Bot. II. 5: 

 70. 1836. 



Plagiochasma chlorocarpum Mont. Fl. Boliv.; d'Orbigny, Voy, 

 dans I'Amer. Mdrid. T: 59. 1839. 



Rupinia chlorocarpa Trevis. Mem. R. 1st. Lomb. III. 4 : 437. 1877. 



On earth, Ollantaytambo, 9,000 feet, July 31, 1911. 



The species of Plagiochasma are in need of considerable study 

 before they can be considered well understood. The determination 

 of the present specimens, therefore, must be regarded as provisional, 

 more especially as the few capsules present are not in good condition 

 P. chlorocarpum is one of the species characterized by minute epider- 

 mal pores. The type material was collected by Bertero, in Chile, in 

 1828, and the species has been reported also in Gay's collections 

 from the same country. Apparently no other stations have been 

 recorded. Soon after the publication of P. chlorocarpum a second 

 species of the genus, likewise based on specimens collected by Bertero 

 in Chile, was proposed by Bischoff under the name P. validum} This 

 species, which is recognized as vahd by the authors of the Synopsis 

 Hepaticarum and also, much more recently, by Stephani, has been 

 reported from Bolivia as well as from Chile. Two Bolivian stations 

 have been recorded: Sorata, Mandon, by Stephani,^ and the vicinity 

 of Mapiri, Bang, b}^ Rusby.^ If the descriptions given by Stephani 

 of these two species are carefully compared no essential differences be- 

 tween them are apparent, and it is possible that P. validum represents 

 a synonym of P. chlorocarpum. Unfortunately the question can not 

 be settled at the present time, although the writer has examined a 

 specimen of Bischoff's plant in the herbarium of the British Museum 

 and has also seen Bang's specimens in the herbarium of the New 

 York Botanical Garden. The latter are apparently the same as those 

 listed above from Peru, but the Bischoff specimen is sterile and so 

 fragmentary that no definite conclusion can be drawn from it. 



1 Handb. Bot. Term, und Systemk. 2 : 56. pi. 56. f. 2753. 1842. 



2 Bull, de I'Herb. Boissier 6; 785. 1898. 



3 Mem. Torrey Club 6 : 129. 1896. 



