626 Morphologie etc. — Palaeontologie. 



Erbario Gussoneano. (Bull. Orto bot. R. Univ. Napoli. II. p. 

 451. avec une figure intercalee dans le texte. 1909.) 



II s'agit d'un exemplaire teratologique ftApargia saxatilis Ten. 

 {Leontodon crispus Vill. var. saxatilis (Rchb.)) recolte par Gussone 

 en 1827 en Calabre. Cet exemplaire, que Trinchieri decrit soigneu- 

 sement, est affecte de „prolification" et, vraisemblablement, aussi de 

 „virescence", phenomenes dejä remarques dans les Composees mais 

 qui n'etaient pas encore connus dans cette espece. 



R. Pampanini. 



Bertrand, C. E., Sur des figures bacteriformes dues ä des 

 causes diverses. — Epaississements cellulaires. — 

 Plastides liberees. — Precipites t'errugineux. (Assoc. 

 franc. Avanc. Sc. Congres de Lille. I. p. 117. 1909.) 



L'auteur Signale trois causes principales ayant donn6 lieu ä la 

 formation de figures pseudobacteriennes. D'abord celles-ci peuvent 

 resulter d'epaississements locaux des parois cellulaires comparables 

 ä ceux des cadres casparyens: c'est le cas pour les formes designees 

 sous les noms de Bacillus Gramma, B. osodeus, B. gomphosoideus. 

 La liberation et l'alteration des plastides peut donner lieu, d'autre 

 part, ä des figures micrococciformes: il en est ainsi pour certains 

 echantillons qualin ees de Micrococcns Gaignardi. Enfin differentes 

 formes de Microcoques ne representent autre chose que des preci- 

 pites limonitiques. R. Zeiller. 



Osborn, T. G. B., The lateral Roots of Amyelon radicans 

 Will., and their Mycorhiza. (Ann. of Botany, XXIII. p. 603— 

 611. pl. 46 & 47. 1909.) 



The author redescribes the tufts of short branched roots origi- 

 nally described by Williamson, and adds to the knowledge of 

 their detail. They have a wide cortex, in the inner region of which 

 are dark cells, many of which contain fungal hyphae. These are 

 non-septate, and some bear terminal vesicles. There is no trace of 

 spore formation , and the author concludes that they were probably 

 of the nature of mycorhiza. M. C. Stopes. 



Thomas, H. H., On acone of Calamostachys Binneyana (Car- 

 ruthers) attached to a leafy shoot. (New Phytologist. VIII. 

 7. p. 249—260. pl. 1. 1909.) 



The paper describes longitudinal sections of a petrified cone of 

 Calamostachys Binneyana which has three or four whorls of foliage 

 leaves below the sporophylls. The leaves are small linear structures, 

 much like the ordinary foliage leaves hitherto described, but dif- 

 fering from them in minor particulars. The leaves are arranged 

 round the axis, as are the bracts, but are not fused at the base. The 

 author enumerates the species of cones of Calamites known as 

 impressions, and Supports Kidston's Suggestion that the impression, 

 Paracalamostachys Williamsoni is identical with the well known 

 petrifaction Calamostachys Binneyana. The author shortly discusses 

 the morphological views of the bracts and sporangiophores, and 

 goes against the view that the bracts are sterile lobes of sporophylls, 

 considering them as nothing but leaves. M. C. Stopes. 



