340 



CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



The algal flora of Great Lake is very scanty and this is associated 

 with an absence of supporting plants, the darkness of the water, and 

 the presence of great quantities of bacteria. 



The phanerogams in Lake Ellis compete with the algse for C0 2 and 

 possibly also for mineral matter, and thus probably tend to decrease 

 the amount of phytoplankton, although the mechanical support which 

 they afford the algss may counterbalance the effect of the competition 

 to some extent. 



The Johns Hopkins University, 



Baltimore, Maryland. 



LITERATURE CITED. 



Fritsch, F. E. The subaerial and freshwater algal flora of the Tropics. Annals of 

 Botany 21: 235-276. 1907. 



Kofoid, C. A. The Plankton of the Illinois River, 1894-1899, with introductory notes 

 on the hydrography of the Illinois River and its basin. Part 1. Quantitative 

 Investigations and General Results. Bulletin of the Illinois State Laboratory of 

 Natural History 6: 95-629. 50 plates. 1903. 



Magnin, A. Recherches sur la vegetation dee Lacs du Jura. Revue Generalede 

 Botanique 5: 241, 303. 1893. 



Pieters, A. J. The plants of Lake St. Clair. Bulletin of the Michigan Fish Commis- 

 sion, No. 2. 1894. 



. The plants of Western Lake Erie, with observations on their distribution. 



Bulletin of the U. S. Fish Commission 21: 57-79. 1902. 



Pond, R. H. The biological relation of aquatic plants to the substratum. U. S. 

 Commission of Fish and Fisheries, Report of the Commissioner 29: 483-526. 



1905. 



LIST OF PLANTS COLLECTED BY W. H. BROWN IN NORTH 



CAROLINA. 



Of the following list the Juncaceae were determined by Mr. Fred- 

 erick V. Coville, the Pteridophyta by Mr. William R. Maxon, and 

 the remainder by Mr. Paul C. Standley. The numbers following the 

 names are the collection numbers. 



Osmunda regalia L. 33. 

 Anchistea virginica (L.) Presl. 105. 

 Lorinseria areola ta (L.) Presl. 30. 

 Polypodium polypodioidea (L.) Hitchc. 



113. 

 Lycopodium adpressum (Chapm.) Lloyd 



& Underw. 14. 

 Lycopodium alopecuroides L. 41. 

 Chamaecyparis thyoides (L.) B. S. P. 



115. 

 Pinua Berotina Michx. 65, 103. 

 Taxodium distichum (L.) Rich. 10. 

 Typha latifolia L. 112. 

 Sagittaria teres S. Wata. 31. 

 Philotria minor (Engelm. ) Small . 4 . 



Arundinaria tecta (Walt.) Muhl. 108. 

 Panicum hemitomon Schult. 42. 

 Panicum lucidum Ashe. 83. 

 Panicum acabriusculum Ell. 52. 

 Sacciolepis striata (L.) Nash. 43. 

 Carex macrokolea Steud. 17. 

 Cyperus haspan L. 34. 

 Dulichium arundinaceum (L.) Britton. 



46. 

 Fuirena hispida Ell. 53. 

 Eleocharis interstincta (Vahl) Roem. & 



Schult. 18. 

 Eleocharis mutata (L.) Roem. & Schult. 



74, 75. 

 Eleocharis prolifera Torr. 63. 



