328 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Yucatan Plants.* — The continuation (fasc. 2) of the flora of the 

 Yucatan peninsula comprises an account of the Compositse by C. F. 

 Millspaugh and Agnes Chase. An important feature is the illustration 

 of every species by cuts showing the form of the flower-head and details 

 of the fruit. There are also a number of full-page plates. 



Fries, R. E. — Zur Kenntnis der Alpinen Flora im Nb'rdlichen Argentinian. 



[An ecologic and systematic account of a botanical exploration of the moun- 

 tains of north-west Argentina under the auspices of the Swedish Chaco 

 Cordillera Expedition, 1901-2.] 



Nova Acta R. Soc. Sci. TJpsal, ser. 4, i. (1905) 

 pp. 1-205 (1 map, 9 pis.). 

 Se liber, G. — Variationen von Jussieua repens. 



[An account of the variations in general form and internal structure when 



the plant is grown under different conditions as regards moisture, light, 



and warmth.] Nova Acta Acad. Caes. Leop.-Carol. German. 



Nat. Cur., lxxxiv. (1905) pp. 147-98 (3 pis.). 



V ierhapper, F. — Monographic der alpinen Erigeron-Arten Enropas und Vorde- 

 rasiens. 



[An exhaustive morphological and systematic account of the Alpine species 



of Erigeron, with details of their distribution in Europe and Asia Minor.] 



Bot. CentralbL, xix., sect. 2 (1906) pp. 385-560 



(6 pis., 2 maps). 



CRYPTOGAMS. 



Pteridophyta. 

 (By A. Gepp, M.A., F.L.S.) 



Anatomy of Fems.|— F. Pelourde has made a comparative study of 

 the root and petiole of certain fern genera, and presents his results in a 

 short note. He comes to the following conclusions : The genera 

 Asplenium, Polypodium, and Adiantum are homogeneous. The former 

 presents great affinity with Scolopendrium and Ceterach, and is easily 

 distinguished from Athyrium, as is also Polypodium from Phegopteris. 

 Nephrodium is heterogeneous, and the author considers this genus should 

 be rearranged to include Aspidium angulare. Finally, Pteridium is 

 quite different from the true species of Pteris. 



Regeneration of the Lamina in Scolopendrium.:}: — W. Figdor 

 describes the experiments he has made on the lamina of Scolopendrium 

 vulgare Sm. to bring about instances of regeneration. His first 

 attempts were unsuccessful ; but when he cut a fraction of a millimetre 

 in length along the middle of the rolled up growing point of a frond, 

 and left it for two to three months, he found that a division had taken 

 place in the tissue of the growing point, and the costa had divided. 

 Between the two branches assimilative tissue had developed. Nowhere 

 was there any sign of healing periderm. The growth which follows a 

 splitting of the growing point of different ages is described, and the 

 author points out that systematists have described as var. dcbdalea Doll, 

 just such a plant as he has produced artificially. He suggests that the 



* Field Columbian Museum, Bot. series, iii. No. 2 (1904) pp. 85-154, profusely 

 illustrated. t Compte3 Rendus. cxlii. (1906) pp. 642-5. 



\ Ber. Deutsch. Bot. Gesell., xxiv. (1906) pp. 13-16 (1 pi.). 



