14 Floristik, Geographie, Systematik etc. 



sac-tubes into which the cytoplasm and nuclei pass, and these tubes 

 meet the pollen tubes in the lower half of the nucellar cone. The 

 compartments of the lower three fourths of the embryo-sac enclose 

 many potentially sexual nuclei. These fuse, so that each compart- 

 ment becomes a uninucleate cell. These compartments form the 

 primary endosperm, whose later growth is distributed over two 

 periods, one before and the second after fertilisation. 

 Four theoretical suggestions are put forward: 



1. That the female cone and the male flower are derived by 

 reduction and specialisation from an amphisporangiate strobilus of 

 a type similar to that of the Bennettiteae. 



2. That the endosperm of the primitive angiosperms was homo- 

 logous with that of Welwitschia. 



3. That the Gnetum-Welwitschia alliance has its origin in the 

 same stock as the angiosperms. but separated from the angiosperm 

 line before the carpel became the pollen-receiver. 



4. That Wehcntschia is the most specialised living representative 

 of the class to which it belongs. A. Robertson. 



Persone, F., Contribuzioni alla Flora della Toscana. I. 

 Monte Am lata. (Bull. Soc. bot. it. 1908. p. 122—123.) 



Dans cette premiere contribution ä la connaissance de la flore 

 de la Toscane, l'auteur enumere les especes suivantes recoltees par 

 lui sur le Mont Amiata et nouvelles pour la Toscane: Holeus 

 Notarisii Nym., Cynoglossuni Coluniriae Ten., Jasione montana L. 

 var. dentata DC. f., Senecio nemorensis L. var. cacaliaster (Lem.) , et 

 le Geum rräa/e L. indique seulement dans 1' Apennin toxan-emilien. 



R. Pampanini. 



Shaw, G. R., The pines of Mexico. (Publications of the Arnold 

 Arboretum N«. 1. March 1909.) 



A quarto of 30 pages, with map and 22 plates after drawings 

 by the author. Eighteen species are differentiated, with a conside- 

 rable number of minor forms, — this conservative treatment being 

 based on extensive field studies, supplementing those of herbarium 

 material. 



The following new names occur: Pinus ayacahnite Veitchii {P. 

 Veitchii Roezl.), P. ayacahuite hrachyptera {P. strobiformis Engelm.), 

 P. leiophyUa chihiiahiiana {P. chihuahiiana Engelm.), P. teocote ma- 

 cvocarpa [P. leiophyUa Benth. in part), P. pseudostrohiis aptdcensis 

 [P. apulcensis Lindl.), P. pseitdostrobus tenuifolia {P. temiifolia Benth.), 

 P. Montesuniae riidis (P. rudis Endl.), P. ponderosa niacrophylla {P. 

 macrophylla Engelm.) , P. ponderosa arisonica (P. arisonica Engelm.) , 

 and P. oocarpa microphylla. Trelease. 



Smith, J. J., Die Orchideen von Java. Figuren Atlas. Erstes 

 Heft. (Leiden, E. J. Brill. 1908.) 



Le Premier fascicule de cet ouvrage qui presente un grand 

 interSt pour le systematicien, non seulement pour celui qui s'occupe 

 de la flore des Indes Neerlandaises, mais encore de l'etude des Or- 

 chidees en general, comprend la figuration de 85 especes. La plupart 

 de ces figures sont originales; pour un certain nombre d'especes non 

 etudiees par l'auteur il a fallu reprendre les figures dans d'autres pu- 

 blications. Les genres suivants sont examines dans ce fascicule qui 



