In the following list, specimens only of my own collection are 

 mentioned, except cultivated forms generally known, about which 

 an immense amount of information may be found in the works 

 of Moore and Lowe and other fern authors. Only those which 

 are little known or which have spontaneously arisen in my cul- 

 tures are mentioned. I do not intend to compile now the great 

 number of cases scattered in the botanical literature of the 

 whole world. This may be done later. 



Trichomanes diaphanum H. B. K. f. furcata. Colombia. 



Hymenophyllum Blumeanum Spr. /. furcata. Ceylon. 



Hymenophyllum obtusum Hook. Arn. /. furcata. Hawaii. 



Hymenophyllum bivalve Sw. /. furcata. New Zealand. 



It is difficult to seek for Hymenophyllum and Trichomanes 

 furcations in herbarium specimens on account of their growing too 

 thickly to be well discerned. 



Woodsia polystichoides Eat. var. incana mh. f. bifida. Culti- 

 vated. 



Woodsia obtusa Torr. /. bifida. Cultivated. 

 Cystopteris fragilis L. /. bifida and /. furcata. Rhenish Prov- 

 inces. 



Cystopteris montana Bernh. f. bifida. Stiria. 

 Nephrodium Miyashianum Mak. /. bifida. Japan. 

 Nephrodium phegopteris Baumg. /. bifida, and /. furcata. 

 Hessia. 



Nephrodium polypodiforme Mak. /. bifida. Japan. 

 Nephrodium decurrens (Raddi) /. bifida. Cultivated. 

 Nephrodium gracilescens Hook. /. bifida. Ceylon. 

 Nephrodium thelypteris Desv. /. bifida. Rhenish Provinces. 

 Nephrodium montanum Bak. /. bifida. Rhenish Provinces. 

 Nephrodium filix-mas Rich. /. bifida and /. furcata. Rhenish 

 Provinces. 



Nephrodium erythrosorum Hook. /. bifida. Cultivated. 

 Nephrodium rigidum Desv. f. bifida. Switzerland. 

 Nephrodium spinulosum Desv. f. bifida, Hamburg; /. fur- 

 cata, Rhenish Provinces. Westfalia. 



