340 SUMMARY OF CURRENT RESEARCHES RELATING TO 



A. S. Foster* gives a short list of the ferns of Paradise Park, 

 namely, seven species collected in Mount Rainier National Park, 

 Washington. 



E. W. Vickers f gives a list of twenty-eight Pteridophytes found in 

 Mahoning County, Ohio, and indeed most of them in Mill Creek Park, 

 which serves almost as an epitome of the county. 



Pteridophytes of Ohio.J — J- H. Schaffner publishes a catalogue of 

 all the sixty-two Pteridophytes known to exist in Ohio, with carefully 

 prepared keys so complete as to enable a student to refer any species to 

 its proper systematic position. For the application of the key to the 

 genera, the specimen must have perfect leaves and petioles and some 

 sporangia ; and the vascular bundles should be examined by section at 

 or very near the base of the petiole. A glossary is appended. 



Ferns of Costa Rica.§ — H. Christ publishes descriptions of seven 

 new species of ferns, and one variety from the collection made in Costa 

 Rica by A. and C. Brade. Costa Rica is one of the richest of the 

 tropical American sources of ferns. 



Ferns of Corea and China. — H. Christ || gives a list of one hundred 

 Pteridophyta collected by Taquet in the Island of Quelpaert during 

 1908. Two species of Dryopteris are described as new to science. 

 He also publishes % a list of seventy-three species collected by Michel 

 in the environs of Gan-Chouen in the province of Kouy-Tcheou. 

 Among these are four new species. 



Bryophyta. 

 (By A. Gepp.) 



Development of Air-chambers in Ricciaceas.** — P. E. Hirsh has 

 studied the origin of the air-chambers in the Ricciaceas, and gives her 

 results. These confirm the view that there are two methods of origin 

 for the air-chambers. 1. In Ricciocarpus and Ricciella they arise by 

 internal cleavage of cell-walls, resulting in the formation of broad, 

 polygonal spaces, separated from one another by unilamellate plates of 

 green cells, and provided with stomata in Ricciocarpus, but not in 

 Ricciella. 2. In Riccia proper they are formed by the upward growth 

 of filaments at right angles to the surface of the thallus, and they 

 alternate with them, being in fact long narrow pits. 



Apospory and Sexuality in the Mosses.ft — El. and Em. Marchal 

 have shown in a previous paper that in dioicous mosses the aposporic 

 protonema resulting from the regeneration of the sporophyte produces 



* Muhlenbergia, v. (1909) p. 144. t Ohio Nat., x. (1910) pp. 86-8. 



X Proc. Ohio State Acad. Sci., v. (1910) pp. 263-306 (figs.). 



§ Fedde's Repertorium, viii. (1910) pp. 17-20. 



i| Bull, de l'Acad. Internat. de Gdogr. Bot., xix. (1910) pp. 4-11. 



f Tom. cit., pp, 12-16. 



** Bull. Torrey Bot. Club, xxxvii. (1910) pp. 73-7 (figs.). 



tt Acad. Roy. de Belg. Bull. Class. Sci., 1909, No. 12, pp. 1249-88. See also 

 Abstract on pp. 1185-6. 



