335 



4.— DICKSONIA. 



1. D. Barometz, Link ; Hook, et Bak. 1. c. 49. Common in ravines, 

 Hongkong ; Taimoshan, Hongkong New Territory ; 

 Lofoushan. 



5.— HYMENOPHYLLUM. 



Key to species. 



Fronds about 6 inches long ... ... 2. 



Fronds under 3 inches long ... .. 3. 



Rachis winged to the base ... ... 3. javanicitm. 



Rachis not winged ... ... ... 2. polyanthos. 



Stalk very short ; frond bipinnatifid ... 4. oxydon. 

 Stalk about 1 inch long ; frond tripin- 



natifid ... ... ... ... 1. tenellum. 



2. H 



3. H, 



H. tenellum, Kuhn ; Hook, et Bak. Syn. Fil. 57. Taimoshan, 

 Hongkong New Territory, 

 polyanthos, Swartz ; Hook, et Bak. 1. c. 60. Lantao Island, 



Taimoshan and Maonshan, Hongkong New Territory, 

 javanicum. Sprang. ; Hook, et Bak. 1. c. 60. Taimoshan on 

 granite rocks at 2500 ft., Hongkong New Territory ; slopes 

 of the Phoenix Mt., Swatow ; Hoifung ; Lofoushan. 

 H. oxydon, Bak. in Journ. Bot. 1890, 262. Taimoshan on 

 rocks at 2500 ft., Hongkong New Territory. 



6.— TRICHOMANES- 



Key to species. 



1. Fronds 5 inches or more long 



Fronds 2 inches or less in length 



2. Stalk winged to the base 



Stalk not winged, or slightly so 



3. Stalk very short or frond sessile 

 Stalk 2 inches or more long 



4. Fronds 8 inches or more long ... 

 Fronds 6 inches or less long 



5. Fronds under 1 inch long 



Fronds over 1 inch long 



6. Fronds fan-shaped 



Fronds obovate-cuneate 



7. Stalk i to i inch long 



Stalk shorter or none 



8. Fronds glabrous 



Nerves of fronds puberulous 



9. Fronds suborbicular or oblong, rhom- 



boidal, not tapering below... 

 Fronds tapering below, oblong-rhom- 

 boidal 



2. 



5. 



8. orientale. 

 3. 



9. auriculatum. 

 4. 



7. radicans. 

 10. rigidum. 

 6. 

 7. 



2. parvulum, 

 1. Henzaianum. 



8. 

 9, 



5. liumile. 



6. Matthewii. 



4. latemarginale. 



3. intramarginale. 



1. T. Henzaianum, Parish ; Hook, et Bak. Syn, Fil, 75. Mt. 

 Parker, Hongkong, 



