Allgemeines. — Anatomie. 613 



Dr. Hermann von Schrenk, „A Disease of the American Ash''. 

 Professor A. W. Evans, „Vegetative Reproduction in Leptolejeunea'^. 

 Professor Co nway M a c M i 1 la n, „Observations on Pterygophora^ . 

 i)r. Margaret E. Ferguson, „Germination of Äßs/iZ/owjce/OHS Spores.f 

 Professor Byron D. Halsted, „Behavior of Mutilated Seedlings". 

 Professor Clara E. Cummings, Notes on New Species of Lichens 



collected by the Harriman Expedition". 

 Professor F. E. Lloyd, „What is the Archesporium?" 

 Dr. Henry Kraemer, „The Continuity of Protoplasm". 

 Professor Duncan S. Johnson, „The Embryology and Germination 



of the Genus Peperomia'' . von Schrenk. 



3rd Annual Meeting of the Botanists of the Central States of 

 America. Chicago. 31. Dec. 1901. 



The following papers were presented : 

 George H. Shull, „Variations in Several Species of Aster". 

 Frederick C. Newcombe, „The Sensory Area of the Roots of Land 



Plants.« 

 Francis Ramaley, „Mesa Vegetation". 

 D. M. Mottier, „The Behavior of the Chromosomes in the Spore 



Mother Cells of Higher Plants and the homology of the Pollen and 



Embryo-sac Mother Cells". 

 Conway Mac Millan, „A Marine Biological Station on the Straits 



of Fuca". 

 £. Mead Wilcox, „Valvulär Torsion as a Means of Seed-dispersal 



in Ricinus". 

 Cyrus A. King, „Fertilization and Some Accompanying Phenomena in 



Araiospora piüchra, one of the Aquatic Phycomycetes"^ . 

 Frederick De Forest Heald, „The Electrical Conductivity of 



Plant Juices". 



B. E Livingston, „Influence of the Osmotic Pressure of the 

 Surrounding Medium upon the Growth and Production of Living Orga- 

 nisms". 



H. G. Timberlake, „Cell Division in Riccia fluitans". 

 Howard S. Reed, „The Ecology of a Glacial Lake". 



C. E. Allen, „Spindle Formation in the Pollen Mother-Cells of Larix". 

 Bruce Fink, „Some interesting Liehen Formations". 



H. C. Co wies, „Ecological Problems connected with Alpine Vegetation". 

 R. A. Harper, „Cell Division in Certain Blue Green Algae". 

 R. A. Harper, „Binucleate Cells in Certain Hymenomycetes"" . 

 James B. Pollock, „An Abnormal Development of the Prothallium 



of the Pollen Grain of Picea excelsa". 

 <:iifton D. Howe, „The Development of the Flora on a Delta Piain 



in Vermont". 

 Charles F. Hottes, „Functions of the nucleolus in plants". 

 H. N. Whitford, „The Physiographic Ecology of a Sand Pit Near 

 Cold Spring Harbor, Long Island". 

 J. M Westgate, „Genetic Development of the Vegetation on an 



Island in the Kansas River". 

 John M. Coulter, „Parthenogenesis in Seed Plants". 



von Schrenk. 



TAN TiEGHEM, L'Hypostase, sa structure et son role 

 constants, sa position et sa forme variables. 

 (Bulletin du Museum d'Histoire Naturelle. 1901. p. 412.) 

 II existe chez les Stigmate'es*) sous la macrodiode une 



couche de tissu lignifie dont le role est d'arreter vers le bas la 



*) En ce qui concerne la terminologie speciale de cette note se 

 reporter ä la p. 214 du present volume. 



