86 BOTANICAL GAZETTE [january 



The next year I went to Formosa to the native place of the plant on 

 the bank of a rivulet in a dense forest at an altitude of about 

 2000 ft. in the northern part of the island, for I wished to see a 

 living specimen of this highly interesting fern. On the first day 

 of our search we were not successful. The difficulty of finding it 

 is partly due to its extreme rarity and partly to its existence only 

 among other ferns closely resembling it in external appearance. 

 On the second day I was at last successful in finding a few speci- 

 mens of Archangiopteris Somai. 



In the summer of 191 7 I went to Chapa in the mountainous 

 regions on the boundary between Yunnan and Tonkin. There too 

 I wondered if I might not have the opportunity of finding some 

 Archangiopteris , and so I made a careful search, turning back the 

 leaves of all similar ferns which I came across. At last, as I had 

 expected, I found a stock of the desired genus, in the shade of the 

 forest at an altitude of about 4000 ft., between Chapa and Mueng- 

 Xen. It was just a single stock. The fern resembled A. Henryi, 

 but differed from it in the absence of indusium scales in the middle 

 of the sori. It was a new species which I propose to call A. sub- 

 integra, a description of it being given in the present paper. Later 

 on I went to Mt. Tamdao in the central part of Tonkin, and col- 

 lected in a forest at an altitude of about 3000 ft. There I saw on 

 the side of the forestry service path one poor specimen which I 

 thought most certainly a species oi Archangiopteris before examining 

 the fern. It was a sterile specimen, yet I believed it to be a plant 

 of the same genus, until I found near by some fertile specimens. 

 They revealed the fact that they were different from Archangiop- 

 teris in fructification, all other characters being exactly like the 

 latter. The sporangia of the newly discovered plant were quite 

 fused together, reminding one exactly of those of Marattia, but 

 differing from the latter in the long linear synangium. I thought 

 that it might be a type of a new genus intermediate between 

 Archangiopteris and Marattia; but I shall refer to this later. Not 

 very far from there I collected a true A rchangiopteris, another new 

 species, which I propose to call A. tamdaoensis . Archangiopteris, 

 therefore, formerly a monotypic genus, has come to comprise 

 4 species. As to distribution, the species are extremely local. 



