1916] AGRICULTURAL BOTANY. ^ 635 



Chondriosomes in fungi and algae, A. Guilliebmond (Rev. G4n. Bot, 27 

 (1915), Nos. 319, pp. 193-207, pis. 2, fig. 1; 320, pp. 236-253, pis. 2; 321, pp. 

 271-28S, pis. 3, fig. 1; 322, pp. 297-315, figs. 2).— Continuing work previously 

 noted (E. S. R., 32, p. 524), the author states that chondriosomes have been 

 found in a large number of fungi, in which they appear to be generally present. 

 In some algae it was impossible to demonstrate their presence, but the chloro- 

 plast, which is here highly differentiated, shows some chemical and histological 

 characters proper to mitochondria and may consist of fine fibrillar mitochon- 

 drial substance, as physiologically it seems to play the role appropriate thereto 

 snd may be considered as a sort of mitochondrial reticulum. In the Cyano- 

 phycete the chondriosome, as such, appears to be completely wanting, but it 

 appears to be more or less completely replaced functionally by the nucleus. 

 The physiological r61e of the chondriosome appears clearly evident in case 

 of fungi, as they produce vesicles which are claimed to be absolutely analogous 

 to those which produce starch in the higher plants. 



The bibliography appended includes titles of 19 contributions by the author. 



Division in mitochondria and their relations with the phenomena of 

 secretion, F. Mokeau (Compt. Rend. Soc. Biol. [Paris], 78 (1915), No. 6, pp. 

 143, lU; abs. in Bot. Centbl., 129 (1915), No. 23, pp. 593, 594).— Considering 

 the three views regarding the origin of mitochondria which are more com- 

 monly held, namely, that they result directly from a protoplasmic differentia- 

 tion, that they are of nuclear origin, and that they arise from preexisting 

 mitochondria, the author prefers the last mentioned, citing studies more par- 

 ticularly relating to certain algae and fungi. It is held that each chondriosome 

 arises from one previously existing, but that mitochondria destined for division 

 do not secrete, and those which do secrete do not divide. 



The formation of crystalloids of mucorin in mitochondria, F. Moeeau 

 (Compt. Rend. Soc. Biol. [Paris], 78 (1915), No. 7, op. 171, 172; abs. in Bot. 

 Centbl., 129 (1915), No. 23, p. 594).— It is stated that in portions of Sporodinia 

 grandis and Rhizopus nigricans mucorin crystalloids are observed to originate 

 and increase in granular mitochondria. 



Internal uredinia, J. F. Adams (Mycologia, 8 (1916), No. 3, pp. 181, 182, 

 pi. 1). — Noting instances previously recorded of deviations from normal devel- 

 opment, the author reports another aberrant case in the production of internal 

 uredinia by Nigredo caryophyllina (Uromyces caryophillinus) in the leaves of 

 Dianthus caryopliyllus in the greenhouse of the Pennsylvania State College. 

 The deviation here noted from the usual method is thought to represent an 

 abnormal rather than a typical condition. 



Asexual hybridization, L. Daniel (Rev. G^n. Bot., 26 (1914), No. 308, pp. 

 SO5-34I, figs. 8; 27 (1915), Nos. 313, pp. 22-29, figs. JO; 314, PP- 33-49, pis. 3, 

 figs. 6). — After a review of observation and opinion regarding graft hybrids, 

 the author reports on his own more recent observations with four asexual 

 graft hybrids. These have been studied somewhat in detail as regards their 

 characters, both external and internal, at different stages. It is considered 

 as of theoretical and practical importance that occasionally this form of hybridi- 

 zation gives rise to characters not previously possessed by either of the stocks 

 concerned in its formation. 



Variation in Cosmos bipinnatus, B. Longo (Atti R. Accad. Lincei, Rend. 

 CI. Sci. Fis., Mat. e Nat., 5. ser., 24 (1915), II, No. 9, pp. 408-410).—A descrip- 

 tive account is given of the variation observed for two consecutive years in the 

 generations of C. bipinnatus. 



Seashore thicket formation by Prunus spinosa, H. Devaxtt (Rev. O^. Bot, 

 27 (1915), No. 320, pp. 225-235, pl. 1, figs. 2). — A description is given of some 



