-8 3 - 



11. Poly podium incanum Sw. forma. There seems to 

 be no doubt about this being P. incanum, and yet it differs 

 in several particulars from our common fern in the 

 Southern States, (i) it is larger; (2) the vestiture is 

 thicker and the texture tougher and more coriaceous; 

 (3) the pinnae, instead of being round at end and nearly 

 the same width throughout, are much the widest at base 

 and taper to the end, thus making them very long trian- 

 gular, with a blunt, acute point; (4) the pinnae also show 

 a tendency to become pinnatifid, one pinna having a pin- 

 nule J cm. long, about in its middle. 



12. Polypodium thysanolepis A. Br. This agrees in 

 size with Lemmon's Arizona specimens. It is one of the 

 four squamose species which J. Smith transferred to his 

 genus Lepicystis, and which together form an exceed- 

 ingly natural group. 



13. Sclaginclla Oaxacana Spring. A beautiful plant 

 which seems to grow in Mexico in great profusion. It is 

 allied to S. flabellata, which is also a native of that coun- 

 try, but our plant has narrower branches and leaflets, and 

 when held in the hand feels as soft as silk. M. & G. 

 knew this only as a Lyco podium, and under another 

 closely allied species they say : " This Lycopod covers 

 large areas in the volcanic soil of woods in the environs 

 of Xalapa, to the almost complete exclusion of every 

 other herbaceous plant. It is to be noted that in these 

 humid woods where the rays of the sun rarely penetrate, 

 the terrestrial Lycopods and many species of ferns, pro- 

 tected from the sun, grow with such abundance that they 

 do not permit other plants to become fixed there." 



14. Sclaginella pilifera A. Br. This species is repre- 

 sented by two small plants, very much bunched together, 

 and without spikes of fruit. They are undoubtedly young 

 plants not yet sufficiently developed to bear fruit. 



There is still another species of fern which has not as 

 yet been determined. So it is held in abeyance until 

 time and opportunity have been realized for further in- 

 vestigation and comparison. 



Clayville, N. Y. 



