359 



2. S. semioordata, Spring ; Bak. 1. c. 48. Mt. Gough, Hongkong ; 



in a wood at Taiwai, Hongkong New Territory ; Chao- 

 chaufu. 



3. S. plumosa, Bak. ; 1. c. 50. In Glenealy ravine above Conduit 



Kd. and Victoria Peak, Hongkong ; Lantao Island, Hong- 

 kong New Territory. 



4. S. concinna, Spring ; Bak. 1. c. 52. Hongkong without locality. 



5. S. atroviridis, Spring ; Bak. 1. c. 77. Not uncommon in shady 



ravines, Hongkong ; Lantao Island, Hongkong New 

 Territory ; hill near Chaochaufu. 



6. S. involvens, Spring ; Bak. 1. c. 87. On Victoria Peak, Mt. 



Nicholson, Mt. Parker, and elsewhere, Hongkong ; Lantao 

 Island, Hongkong New Territory. 



7. S. canaliculata, Bak. ; 1. c. 91. Mt. Gough, Happy VaUey 



woods, and Taitam catchwater, Hongkong. 



8. S. caulescens, Spring ; Bak. 1, c. 94. Lofoushan. 



9. S. flabellata, Spring ; Bak. 1. c. 98. Mt. Gough, Taitamtuk, 



Happy Valley woods and elsewhere, Hongkong, 



10. S. xipMolepis, Bak. ; 1. c. 108. Hongkong without locality. 



11. S. proniflora, Bak.; 1. c. 108. Little Hongkong, Hongkong; 



Lantao Island, Hongkong New Territory. 



12. S. heterostachys, Bak. ; 1. c. 110. Hongkong without locality. 



13. S. tenera, Spring ; Bak. 1. c. 118. Victoria Peak, Mt. Kellet, 



Mt, Gough, and shady banks on the Aberdeen New E>oad, 

 Hongkong. 



EHIZOCARPEAE. 



Key to genera. 



1. Land plant with single conceptacles, 



containing one kind of sporange ... 2. 



Floating plant ; conceptacles double, 



containing two kinds of sporange 3. Marsilea. 



2. Leaves entire with anastomosing vena- 



tion ... ... ... ... ... 1. Salvinia. 



Leaves very small, bifid, simple veined 2. Azolla. 



1.— SALVINIA. 



1. S. natans, Hoffm. ; Bak. Fern AUies, 135. North Point, 

 Hongkong ; ditches near Chaochaufu. 



2.— AZOLLA. 



1, A. caroliniana, Willd. ; Bak. Fern AUies, 138. East Point, 

 Hongkong ; Lantao Island, Hongkong New Territory ; 

 Ngchungshan, north of Mirs Bay, near Hongkong. 



3.— MARSILEA. 



1. M, quadrifoliata, Linn. ; Bak, Fern Allies, 139, Stream near 

 Chaochaufu j West River. 



