Physiologie. — Palaeontologie. — Fungi, etc. 491 



•der hyperalkalischen Lösung, nötig ist. Die erste Frage muss bejaht 

 werden. Verf. betrachtet die Versuche als eine neue Stütze für 

 seine Annahme, „dass das Wesen der Entwicklungserregung in 

 gewissen Ox^^dationsprozessen zu suchen ist, die vermutlich die Vor- 

 aussetzung der Nucleinsynthese bilden." O. Damm. 



Britton, E. G. and A. Holliek. American Fossil Mosses with 

 Descriptions of new Species from Florissant, Colorado. 

 (Contrib. N. Y. Bot. Card., XXXIX. p. 139—141. PL 9. 1907.) 



A revision of certain previously described species of Hypnum, 

 together with the description of a new genus and species {Glypho- 

 niitriiim cockerelleae , B. & H.) from the Tertiary of Florissant, 

 Colorado. D. P. Penhallow. 



Holliek, A., Systematic Palaeontolog}^ of the Pleistocene 

 Deposits of Maryland: Pteridophyta and Sperniatoph xta. (Con trib. 

 N. Y. Bot. Card., LXXXV. p. 217—237. PL LXVII— LXXV. 1906.) 



This somewhat extended account of the Pleistocene flora, esta- 

 blishes an important point of contact between existing floras and 

 those of early Tertiary times, several species of Eocene and Miocene 

 age being represented. On the other hand, existing species are 

 somewhat abundant. One new genus is created for the reception of 

 a type related to Alisma and to Musophyllmn complicatum of 

 Lesquereux. This is to be known as Monocotyledon , but no spe- 

 cific form has been designated. Ten new species are recorded. The 

 majority of these are assigned names which show an intimate relation 

 to existing species of which they are regarded as the ancestral forms , 

 modified probably, by the extreme physical alterations incident to 

 and following upon the glacial period. D. P. Penhallow. 



Blakeslee, A. F., Heterothallism in Bread Mold, Rhisopiis 

 Nigriccüis. (Botanical Gazette, XLIIL p. 415. 1907.) 



A-further discussion of the author's well-known theory of homo- 

 thallic and heterothallic groups in the Mucorineae, in which he 

 summarizes and criticises certain recent papers of Hamaker and 

 Namyslowski for the details of which the original should be con- 

 sulted. Von Schrenk. 



Boudier, E., Histoire et Classification des Discomycetes 

 d'Europe. (Paris, P. Klinksieck. 8'^. VII, 223 pp. 1907.) 



Cet important travail est un Genera des Discomycetes euro- 

 peens avec les caracteres distinctifs des divisions, sections, familles 

 et genres et'l'enumeration de toutes les especes rapportees ä chaque 

 genre. On arrive ä un total de 3300 especes environ et de 226 

 genres. Les circonscriptions generiques different notablement de 

 Celles qui sont communement admises; mais, comme les anciens 

 noms sont le plus souvent gardes, on doit presque toujours ajouter 

 les mots pro parte apres les noms des auteurs. Ces reformes sont 

 le fruit d'un labeur ininterrompu de quarante ans. Personne n'avait 

 plus d'autorite que Boudier pour les entreprendre. II ne semble pas 

 possible de donner une Classification morphologique plus conforme 

 ä Fetat actuel de nos connaissances ni un guide plus sür pour arri- 

 ver ä la determination des genres d'apres l'ensemble des caracteres 

 du receptacle adulte. 



