1S6 THE PLAXT WOHLD. 



Channel, and differed in no respect from the specimens in the 

 Gray Herbarium, which came from Golden Gate, California. 



Princeton University, March 7, 1007. 



TERATOLOGIC NOTES. 



By Professor Johx \V. Harsiiberger. 



These notes represent observations made on a number of 

 iil)n(irnial forms of plants collected at various times and pre- 

 served in alcohol for future dissectic^n and study. They show 

 tlie range to which a healthy plant can modify its organs, with- 

 iiut sacriticing the mophologic identity of the different parts. I 

 am unable in this paper to throw any light upon the genesis of 

 the abnoruial structures in question, nor am I able to say whether 

 these teratol<>gic forms could be propagated so as to show that 

 they are hereditarily transmitted. I think they are of sufficient 

 morphologic interest without a discussion of their genesis or 

 character. 



Fasciation in MarcJiantia. I collected in August, 1003, 

 at Pocono Pines, a specimen of this liverwort which showed the 

 fusion of the stalks of two archegoniophores. The fasciation 

 extended nearly to the top, but there the stalks diverged from 

 each other, each fork bearing a one-sided, umbrelloid, upper 

 porrii:)n v.'itli the usual rows of archegonia. 



Forlced Frond of Nephrolepis exaltata. Mr. Henry B. 

 Evans presented to me a frond of the sword fern Nephrolepis 

 exaltata two feet four inches long, which forked nineteen inches 

 f ri:)m the leaf base into two exactly equal forks, each bearing the 

 n(»rmal kind of two-ranked i^innules with the characteristic rows 



JL 



of sori. 



Fi educed Iris Flower. One of the most interesting speci- 

 mens in the al)0\-e mentioned teratologic collection is an Tris 

 liower from one of the hybrid garden forms with only one sepal, 

 no })etals, a single stamen standing opposite to the large petaloid 

 style arm. The stamen is nornud in structure and position and 



