The Ohio IJ^atiiralist, 
PUBLISHED BY 
The Biological Club of the Ohio State Uni’versity. 
Volume V. MARCH, 1905. No. 5. 
TABLE OF CONTENTS 
W.\CKEK — Ecological Notes on Ohio Ptericlophytes 29.5 
Fi.ory— Key to the Ohio Jlaplcs in the Winter Condition 297 
ScHAFFNEli— The Classiticiition of Plants, I 298 
Scii.iFFNER— Lycopodium iiorophiliiin in Ohio 301 
.SciiAFFNER— The Struggle for Life on a Ceitain Sandbar 302 
Kinni.E— Notes on the .Mori)hology of Philotria 304 
Tii.i.man— Ohio Plants with Tendrils ,305 
SciiAFFNER— Key to (ihio Walnuts Based on Twig Characters 307 
Surface — Meeting of the Biological Club 308 
ECOLOGICAL NOTES ON OHIO PTERIDOPHYTES. 
Alma H. Wacker, 
Of the one hundred and nineteen Pteridophi^tes which Britton 
has listed for the Northeastern United States and of the two 
hundred and seventy-two recorded by Underwood for North 
America north of Mexico, at least sixty have been found in Ohio. 
This number includes the ferns, horsetails, Lycopods, Selagnellas 
and Azolla. 
When looking for Pteridophytes it is well to remember that 
they grow under widely diverse conditions; from exposed rocks 
and sandy soil, meadows and rich woods to swamps and standing 
water 
Besides the reproduction by spores other means of propaga- 
tion are present in most species. Rhizone propagation is one of 
the most common means. The rhizomes or underground stems 
may be upright as in Oiihioglossum, or horizontal as in most of 
the ordinary ferns. They may be smooth or scaly, branched or 
unbranched ; 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 bv special gemmse or 
brood-buds is present as in Filix bulbifera, while in Lycopodium 
lucidulum there are peculiar modihed 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 
rhizophyllus, Asplenium x^hinatifidum, A. platyneuron, and A. 
ebenoides. There is another kind of propagation which may be 
