Band 123. Nr. 24. XXXIV. Jahrgang. II. Bd. Nr. 24. 



Botanisches Centralblatt 



Referirendes Organ 



der 



Association Internationale des Botanistes 

 für das Gesamtgebiet der Botanik. 



Herausgegeben unter der Leitung 

 des Präsidenten : des Vice- Präsidenten: des Secretärs: 



Prof. Dr. E. Warming. Prof. Dr. F. W. Oliver. Dr. J. P. Lotsy. 



und der Redactions-Commissioiis-AfitgUeder : 



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



Prot. Dr. C. Wehraer und Dr. C. H. Ostenfeld. 



von zahlreichen Specialredacieuren in den verschiedenen Ländern. 



Dr. J. P. Lotsy, Chefredacteur. 



No. 49. 



Abonnement für das halbe Jaiir 14 Mark 

 durch alle Buchhandlungen und Postanstalten. 



1913. 



Alle für die Redaction bestimmten Sendungen sind zu richten an: 

 Redaction des Botanischen Centralbiattes, Haarlem (Kolland), Spaarnei?. 



Hill, A. W., The Production ofHairs on the Sterns and 

 Petioles of Tropaeolum peregriniim L. (Ann. Bot. XXVI. p. 

 589—592. 1 pl. 7 textfig. 1912.) 



The common Canary-creeper or 'Canariensis' of gardens {Tro- 

 paeolum peregriiiuni L.) is generally assumed to be a typically gla- 

 brous plant. The author however noticed a case in which the laminae 

 of the leaves had been eaten by snails, and in which a few hairs 

 had been formed. This Observation suggested to him that experi- 

 mental work might be done upon the production of hairs in this 

 plant. Accordingly he performed a series of experiments in which 

 the leaves of seedlings were successiveiy removed as they developed, 

 so that the plants were compelled to depend upon their green stems 

 and petioles alone for assimilation and transpiration. Under these 

 circumstances a dense feit of hairs was produced in the course of 

 a few days. It is suggested that this hair production ma}'' be due 

 to the excess of water supplied to the plant in its abnormal con- 

 dition, and to the sudden arrest of growch due to the removal of 

 the large evaporating and growing surface represented by the 

 laminae. Agnes Arber (Cambridge). 



Fries, R. E., Zur Kenntnis der afrikanischen Dorstenia- 

 Arten. (Ark. f. Bot, XIII. W. 1. 20 pp. 2 Taf. 1913.) 



Während der schwedischen Kongo-Rhodesia-Expedition sam- 

 melte der Verf 8 Dorstenia- Arten, und zwar in Kongo D. querci- 

 folia n. sp. und Barnimiana, in Nordost-Rhodesia,/). stenophylla 

 n. sp., rhodesiana n. sp., mirabilis n. sp., Rosenii n. sp. mit var. niul- 



Botan. Centralblatt. Band 123. 1913. 39 



