NOTES AND ABSTRACTS. 



881 



(cotyledons, plumule, and upper hypocotyl) be cut off and laid on wet 

 sand, then tender roots arise from the lower part of the hypocotyl. The 

 author gives a list of plants in which cut-off leaves can throw out roots. 

 He found that a great many cotyledons, when separated, can produce roots, 

 and that in Cucumis, Cucurbita, and Luffa shoots may- be formed. 

 The roots arise above the wound on either side of the cotyledon, but the 

 buds are always on the upper side. Galls of Salix can also produce 

 adventitious roots. In the second paper the author considers the 

 inequalities of the leaves (anisophylly) of these adventitious shoots 

 produced from leaves, and shows that the small leaf is almost always 

 uppermost. Adventitious leaves are also recorded. — G. F. S.-E. 



Regeneration in Utrieularia [and other Plants]. By K. 



Goebel (Flora, xciii. 1904, pp. 98-126 ; 17 cuts).— The leaves of many 

 Lentibulariacece produce adventitious roots ; in Pinguicula at the base of 

 the leaves ; in Utrieularia diffused or limited to certain regions, i.e. the 

 forks, the stalk of the bladders, the leaf-base. They may be formed on 

 isolated leaves, or on attached leaves when the normal shoot-apices are 

 removed. They may be produced in the same species, or even the same 

 leaf, from embryonic or from adult tissue. In the species with prolonged 

 apical growth of the leaf the regeneration takes place at the apical scar if 

 the point is removed. Regeneration is influenced by the distribution of 

 the bundles, and by the provision of reserves available for growth. Thus 

 in Cuscuta adventitious buds appear on the stem near the haustoria. 

 Additional facts are given on regeneration in Begonia, Cardamine, 

 Torenia, &G.—M. H. 



Resin-flow, On the SO-called. By A. Tschirsch (Flora, xciii. 

 1904, pp. 179-198 ; 5 cuts). — The flow of resin after injury may be dis- 

 tinguished into primary and secondary. The primary flow from normally 

 present resin channels can only take place in plants which possess these, 

 and even so is limited. The secondary flow is due to the pathological 

 formation on the inner side of the cambium of wood, chiefly consisting of 

 parenchyma with numerous resin channels, at first schizogenous, after- 

 wards lysigenous. As the effect of the wound passes off a zone of new 

 wood free from these is produced, and the flow is arrested. Such patho- 

 logical resiniferous wood is produced in plants which have normally resin 

 canals in the cortex only, as in the Spruce (' Tanne '), or in the young wood 

 only (Tohiifera), or none at all (Styracacece). Resin galls are produced 

 by the overgrowth and final inclosure of the resin by the new wood at the 

 margin of the wound. — M. H. 



Rhamneae, Anatomy Of. By Theodor Herzog (Miinchen) (Beih. 

 Bot. Cent. xv. pp. 95-207). — Gives a thorough description of the 

 anatomical details of 130 species and three varieties belonging to the 

 tribes Ventilaginece, Zizyphece, and Bhamnece. The anatomical differences 

 seem to correspond fairly well both with differences in distribution and in 

 purely systematic classification by floral characters. The identity of 

 various species surmised by Weberbauer has been confirmed by the 

 anatomy. Styloid crystals are found in Gouanice, large crystal glands 



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