Band 141. Nr. 1. XL. Jahrgang. II. Bd. Nr. 1. 



Botanisches Centralblatt. 



Referierendes Organ 



der 



Association Internationale des Botanistes 

 für das Gesamtgebiet der Botanik. 



Herausgegeben unter der Leitung 

 des Präsidenten: des Vice- Präsidenten.' des Secretärs: 



Dr. D. H. Scott. Prof. Dr. Wm. Trelease. Dr. J. P. Lotsy. 



und der Redactions-Commissions- Mitglieder : 



Prof. Dr. Wm. Trelease, Dr. C. Bonaventura, A. D. Cotton, 



Prof. Dr. C. Wehmer und Mag. C. Christensen. 



von zahlreichen Specialredacteuren in den verschiedenen Ländern. 



Dr. J. P. Lotsy, Chefredacteur. 



Abonnement für das halbe Jahr 25 Mark 1010 



NO. -6. durch alle Buchhandlungen und Postanstalten. 1J19 * 



Alle für die Redaction bestimmten Sendungen sind zu richten an: 

 Redaction des Botanischen Centralblattes, Haarlem (Holland), Spaarnei7. 



Anonymus. The botany and plant products of northern 

 South America. (Science. N. S. XLVIII. p. 156—157. Aug. 16, 

 1918.) 



Prospectus of a cooperative undertaking of the New York 

 Botanical Garden, The United States National Museum and the 

 Gray Herbarium of Harvard University. Trelease. 



Arbep, A., The Phyllode Theory of the Monocotyledo- 

 nous Leaf, with Special Reference to AnatomicalEvi- 

 dence. (Ann. Bot. XXXII. p. 465—501. 32 textfigs. 1918.) 



The first part of the present paper opens with a discussion and 

 ampliücation of De Candolle's theory of the Monocotyledonous 

 leaf and of Henslow's corollary to that theory. Ascending to De 

 Candolle's theory, the typical Monocotyledonous leaf is inter- 

 preted as equivalent to the leaf-base and petiole alone of a Dicoty- 

 ledon, but the present author regards certain Monocotyledonous 

 leaves as having been still further reduced until they are equivalent 

 to leaf-bases only. Henslow's corollary explains the 'lamina' 

 of these Monocotyledonous leaves which show a distribution between 

 petiole and blade, as being merely an expansion of the apical re- 

 gion of the original phyllode, and ühus not homologous with the 

 lamina of a Dicotyledon; the present writer proposes to call such 

 a blade a 'pseudo-lamina'. 



Asa Gray 's tentative Suggestion that some Gymnosperm lea- 

 ves might be equivalent to petioles is recalled and expanded, and 

 the writer suggests its special application on the case of the Gne- 



Botan. Centralblatt. Band 141. 1919. I 



