c 



LU LIBR AR Y - 



I'he Ohio ^JSCatiiralist, 



PUBLISHED BY 



The Biological Club of the Ohio Slate Uni'versily. 



Volume V. 



MARCH. 1905. 



No. 5. 



TABLE OF CONTENTS 



Wacker— Ecological Notes ou Ohio Ptoridoph ytes 295 



Flory— Key to tlie Ohio Mapks in the Winter Condition 297 



ScHAFFNER— The Classification of Plants, 1 298 



ScHAFFNER— Lycopodium porophilum in Ohio , r SOI 



Schaffner— The Struggle for Life on a Ceitain Saudl)ar ;!02 



Riddle— Notes on the :\rorpht)li my ( )f Philotria o04 



Tillman— Ohio Plants with Tendrils 30.3 



ScHAFFNER— Key to Ohio Walnuts Based on Twig Characters S07 



.Surface— iMeeting of the Biological Clul) 308 



ECOLOGICAL NOTES ON OHIO PTERIDOPHYTES. 



Alma H. Wacker. 



Of the one hundred and nineteen Pteridophytes which Britten 

 has hsted for the Northeastern United States and of the tw'O 

 hundred and seventy-two recorded by Underwood for North 

 America north of Mexico, at least sixty have been found in Ohio. 

 This number inckides the ferns, horsetails, Lycopods, Selagnellas 

 and Azolla. 



When looking for Pteridophytes it is well to remember that 

 thev grow under widely diverse conditions; from exposed rocks 

 and' sandv soil, meadows and rich woods to sw^amps and standing 

 w-ater 



Besides the reproduction by spores other means of propaga- 

 tion are present in most species. Rhizone propagation is one of 

 the most commion means. The rhizomes or underground stems 

 may be upright as in Ophioglossum, or horizontal as in most of 

 the ordinarv ferns. They may be smooth or scaly, branched or 

 unl )ranched ; or they may be found creeping upon the ground and 

 sending roots into the earth as in some of the Lycopods. 



In some species vegetative propagation by special gemmse or 

 brood-buds is present as in Filix bulbifera, wdiile in Lycopodium 

 hicidulum there are peculiar modified buds. These drop to the 

 ground and give rise to new^ plants. 



A few ferns have leaf propagation; the tip of the leaf takes 

 root and develops a new plant. This occurs in Camptosorus 

 rhizophvllus, Asplenium pinnatifidum, A. platy neuron, and X. 

 ebenoides. There is another kind of propagation which may be 



