174 Pteridophyten. — Pflanzenchemie. 



ture of the trichomes, scales, hairs and glands form very constant 

 characters "not for the single speeies only, but also for groups of 

 species by other characters were found to be closely related " In 

 using this discovery together with other characters he has subdivided 

 the genus into 10 subgenera, of which he gives descriptions, notes 

 and examples of species. 



The subgenera are the following: 



1. Eadryopteris, the type of which is D. filix mas. The centre of 

 this subgenus is EastAsia. 



2. Stigmatopteris (C. Chr. 1909 as genus), differs from the fore- 

 going by the exindusiate sori, etc. Central and South America. 



3. Cteuitis C. Chr., distinguished by the presence of reddish, 

 articulated hairs and the structure of the scales, etc. Mostly tropical 

 and the Philippines. 



4. Lastrea (Bory) emend., contains the species of the groups: 

 D. opposita, D. oreopteris, D. thelypteris, D. pteroideo and D. immer sa. 

 America, Europa, Asia, Africa, Polynesia. 



5. Glaphyropteris (Presl.). Small subgenus the type of which is 

 D. decnssata (L.) Urb. America. 



6. Steiropteris C. Chr. Small subgenus. nearly only tropical- 

 Americans ferns, e. g. D. Wrightii (Mett.) O. Ktze. 



7. Cyclosorus (Link) emend. Partly American species, e. g. D. 

 patens (Sw.), partly common tropical species, e. g. D. mollis (Jacq.), 

 and partly Asiatic and Polynesian species. Among the Asiatic spe- 

 cies are several which have been included in the subgenus Menis- 

 cium, but which the author prefers to take as belonging to Cyclosorus. 



8. Leptogramma (J. Sm.) differs from the foregoing subgenus 

 by the exindusiate sori and the setose sporangia. 



9. Goniopteris (Presl.) emend., a mainly American subgenus 

 distinguished by its venation, branched hairs, lack of glands and 

 gemmiferous rachis. Two groups: a. Asterochlanea : Lamina entire 

 or pinnate-bipinnatirid, upwards narrowed into a bipinnatifid apex: 

 6. Eu^oniopteris: Lamina pinnate or bipinnatifid with a distinct ter- 

 minal pinna similar to the lateral ones. 



10. Meniscium (Schreber). Purely American subgenus, distin- 

 guished by the meniscioid venation, confluent sori, etc. 



New combinations are the following names: 1. Dryopteris Fran- 

 coana (Fourn.) Chr. (Aspidium Francocuium Fourn.; D. Harrisoni 

 (Bak.) C. Chr.; D. subintegra (Sod.) C. Chr.); 2. D. guadelupensis 

 (Wikstr.) C. Chr. (Polypodium guadelupense Wikstr.; D. scolopendri- 

 oides C. Chr.); 3. D. sclerophylla (Kze) C. Chr. (Aspidium sclero- 

 phyttum Kze; D. Sintenisii (Kuhn) Urb.; D.jamaicensis (Jenm.) C. Chr.); 

 4. D. paucijuga (Kl.) C. Chr. (Aspidium paucifugum Kl.; D. John- 

 stoni Maxon); 5. D. scabra (Pr.) C. Chr. (Polypodium scabrum Pr.; 

 Xephrodium tetragonum Bak.; Aspidium Caesarianum Christ.); 6. D. 

 monosora (Pr.) C. Chr. (Lastrea monosora Pr.; Aspidium monosti- 

 chum Kze). C. H. Ostenfeld. 



Bortrand, G. et Rosenblatt. Sur la temperature mortelle des 

 tyrosinases vegetales. (Ann. Inst. Pasteur. XXIX. p. 653—657. 



1910.) 



II existe, chez les vegetaux, des Varietes de tyrosinases dont la 

 temperature mortelle est tres differente. Ce sont les tyrosinases 

 d*origine mycologique qui sont les plus fragiles; les tyrosinases les 

 plus stables proviennent, au contraire, des vegetaux superieurs. La 



