r 



Index to recent Literature 397 



Purpus, C. A. Eine Succulententour nach Baja California (Mexiko). 

 Monatssch. fiir Kakteenkund, 9: 33-38. 15 I\Ir. 1899. 



Robinson, B. L. Revision of the Genus Guan/io/a, Bull. Torr. 

 Bot. Club, 26: 232-235. 15 My. 1899. 



Author proposes as new Guardiola Rosei, G, carinata and G. odoutophylla, and 

 gives specific rank to G. Tuioiarpus arptta Gray and G. Tuhcarpus an^ustifolia Gray. 



Perrot, M. E. Anatomic comparee des Gentianacees. Ann. Sc. Nat. 

 Bot. VIII. 7: 105-292.//. j-p. 1899. 



Putnam, B. L. A white form of Carduus arvensis. Asa Gray Bull. 

 " 7 : 37. Ap. 1899. 



Ricome, M. H. Recherches experimentales sur la symetrie des Ra- 

 meaux Floraux. Ann. Sc. Nat. Bot. VIIT. g : 293-396. //. lo-ij, 

 1899. 



Rowlee, W. W. Historic Trees of North America, i. The Wash- 

 ington Elm. Plant AVorld, 2: 125, 126. 1899. 



Rowlee, W. W. Description of two AVillows from Central Mexico. 

 Bot. Gaz. 27: 136-138. / 1-2. F. 1898. 



Rydberg, P. A. The cespitose Willows of Arctic America and the 

 Rocky Mountains. Bull. N. Y. Bot. Garden, i : 257-278. 13 Ap. 

 1899. 



Salix J>alaeoneura, S. petrophila, S. Macoimii, S. JVag/iomei, S. niphoclada, S. 

 Labradonca and S. Dodgemia^ sp. nov. 



Salmon, E, S. Notes on the Genus Nanomitrium Lindb. Jour. 



Linn. Soc. 34: 163-170. //, j-. i Ap. 1899. 

 Sargent, C. S. New or little-known North American Trees. Bot. 



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Gaz. 27 : 81-94. F. 1S99. 

 Saunders, C. F. Listera 7'emformis. Plant World, 2: 129. My. 



1899. 



Saunders, De A. New and little-known brown Algae of the Pacific 

 Coast. Erythea, 7: 37-40.//. z. i Ap. 1899. 



[lapalospongidion gelaihiosian gen. et sp. nov.; notes on Ltptouenia fixscicnlatiif}i. 

 Reinke. 



Schumann, K. Zwei neue Arten von Echinocactus aus Paraguay. 

 Monatssch. fiir Kakteenkunde, 9: 44-46. 15 Mr. 1899. 



K. Grossei and E. nigrispinus sp, nov. 



Selby, H. D. Additional host Plants oi Plasmopara Cubensis, Bot. 

 Gaz. 27: 67, 68. J. 1899. 



.Setchell, W. A. Notes on Cyanophyceae, III. Erythea, 7 : 45-55. 

 //. 2, J. I My. 1899. 



Scytonona caldarium^ S, occidcntale^ and N'ostoc ampIissMmtf}i ^ sp. nov. 



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