222 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Adanson published the name Dryopteris, Schuiidel had already put 

 forward the name Thelypteris for the same group of ferns, and in 

 connexion therewith published an illustration of the marsh-fern 

 Nephrodiwm Thelypteris which is unmistakable. W. N. Clute protests 

 strongly against these wholesale changes of nomenclature, and questions 

 whether according to American rules a still earlier use may not be found 

 for Thelypteris in replacing Pteris rather than Dryopteris. 



Fern-flora of Spain and Portugal.* — R. de Litardiere publishes a 

 contribution to the study of the fern-flora of the Iberian Peninsula. A 

 total of 70 native species and sub-species is known in Spain and Portugal, 

 G5 occurring in Spain and 42 in Portugal ; thus five of them are not 

 found in Spain and 28 not found in Portugal ; and they are indicated in 

 lists. The fern-flora is very varied, ranging from the Arctic-alpine 

 species of the high mountains to the Canarian species scattered along the 

 shores ; there is a good representation of the ferns of Central Europe, 

 and all the Mediterranean species are found ; also three endemic species 

 and several endemic forms occur. The author gives analytical lists 

 under the following headings : — (1) Element of the forest region of the 

 northern hemisphere ; (2) Atlantic element ; (3) Mediterranean element ; 

 (4) Arctic-alpine element; (5) Alpine element; (6) Cosmopolitan 

 element; (7) Sub-tropical element ; (8) Endemic element. The author 

 then adds a series of notes on the more interesting species and forms, 

 especially the new Asplenium majoricum from the Balearic Islands, and 

 Dryopteris africana which with D. semula, Gystopteris diapliana, 

 Asplenium hemionitis, Davallia canariensis, and Woodtcardia radicans, 

 forms a vestige of the rich Canarian vegetation which prevailed in 

 Pliocene times. 



Ferns of South Croatia. f — L. Rossi gives an account of the 

 Tteridophytes of South Croatia, the results of many years of collecting. 

 In all there are 43 species and many varieties and forms. Some of the 

 forms are new. The local distribution of the plants is recorded. 



Ferns of North America. — E. J. Hill $ publishes some notes on 

 American ferns : (1) Woodtcardia virginica, a rare plant, always grows 

 associated with Sphagnacea3, especially with S. recurvum in the wettest 

 part of a swamp ; (2) Nephrodium spinulosum ; (3) Dicksonia punctilo- 

 bula and its distribution in the United States ; (4) Botrychium obliquum 

 and B. ternatum var. intermedium, their distribution and their difference 

 in time of spore-ripening. 



TV. N. Clute § writes of the genus Hemionitis and gives a figure of 

 H. arifolia, a Philippine species. He also shows || how Pellsea atropur- 

 purea may be recognized even in quite a juvenile stage. Under the 

 heading % Pteridographia he has put together some notes on Nephrolepis ; 

 Azolla and mosquitos ; Apospory in ferns ; an evergreen L 'ystopteris ; 

 Botrychium ; a fragrant marsh-fern. 



* Bull. Geogr. Bot., xxi. (1911) pp. 12-30. 



t Magyar Bot. Lapok., x. (1911) pp. 22-38. 



\ Fern Bull., xviii. (1910) pp. 65-76. § Torn, cit., pp. 76-3. 



I| Tom. cit., pp. 79-80. f Tom. cit., pp. S3-7. 



