May, 1920] MORPHOLOGY, ETC., VASC. PLANTS 223 



1569. Longo, B. Richerche su la poliembrionia. [Studies on polyembryony.] Ann. 

 Botanica [Roma] 14: 151-162. 1 fig. Aug. 30, 1917. — Specimens of the ovaries of Xanthoxy- 

 lum alatum Roxb. were examined and compared with the carpels and fruiting parts of X. 

 Bungei Planch previously studied by the author. Statistical study of the number of cases of 

 polyembryony occurring shows that this phenomenon is not as common as in the case >i the 

 latter plant. The study of the species of Shimmia resulted negatively because of the more or 

 less complete abortion of the pistil in these plants. Vegetative regeneration of Skimmia sp. 

 growing for a numbers of years, especially as to root development, was observed, though no 

 buds appeared. The plants were found to produce seedless or aborted-seeded fruits without 

 pollination. Rudimentary vivipary of Skiynmia was demonstrated. — J. A. Nieuuiand. 



1570. Mascre. Nouvelles remarques sur le role de l'assise nourriciere du pollen. [Con- 

 cerning the function of the tapetum.] Compt. Rend. Acad. Sci. Paris 168: 1214-1216. 1919.— 

 A brief description of certain features in the development of the tapetum of certain genera 

 of the Solanaceae together with notes on the functions and cell content of the cells of the 

 tapetum. The following forms were studied in more or less detail, viz., Datura arborea L., 



D. Stramonium L., D. Talula L., Solarium Dulcamara L., Atropa Belladonna L., Nicandra 

 physaloides Gaertn., and Solanum tuberosum L. Other genera mentioned are Hyoscyamus, 

 Nicotiana, Lycium, Digitalis, Anchusa and Symphytum. — V. H. Young. 



1571. Mottet, S. Pomme de terre gigogne. [A monstrous potato.] Revue Horticole 

 91 : 255-256. Fig. 88. Mar., 1919. — A monstrous form of the potato in which eight small 

 tubers are clustered at the end of a large one, is described. Two other specimens, one the 

 form of a duck and the other the form of a hand, are cited as having been previously listed. — 



E. J. Kraus. 



1572. Nakajima, Y6z6. Midzu-ohbako no kwajitsu no howai gensho ni tsuite. tJber 

 das Verbreitungsmittel der Samen von Ottelia alismoides Pers. [On the method of seed 

 distribution of Ottelia alismoides Pers.] [Title in Japanese and German, text in Japanese.] 

 Bot. Mag. Tokyo 33 : 44-52. March, 1919.— See Bot. Absts. 4, Entry 249. 



1573. [Norstedt, C. T. O.] [Swedish rev. of: Harms, U. Uber die Geschlechtvertheilung 

 bei Drya octopetala L. nach Beobachtungen in Kgl. Botanischen Garten Berlin-Dahlem. (Con- 

 cerning sex ratios in Drya octopetala.) Ber. Deutsch. Bot. Ges. 36:292-300. Fig. 6-10. 

 1918.] Bot. Notiser 1918:247. 1918. 



1574. Schaffner, John H. Unusual dichotcmous branching in Vernonia. Ohio Jour. 

 Sci. 19: 487-490. 1919. — At Emporia and Meriden, Kansas, dichotomy in the stems of Ver- 

 nonia baldwinii Torr. was found to be of wide distribution and abundant occurrence. Fascia- 

 tion was relatively rare. The dichotomy is considered as a case of ever-sporting or recurrent 

 variation. — H. D. Hooker, Jr. 



1575. Schaffner, John H. The nature of the dioecious condition in Morus alba and Salix 

 amygdaloides. Ohio Jour. Sci. 19: 409-416. 1919. — Of 66 Morus alba trees examined. 28 were 

 found to be carpellate, 24 staminate and 14 intermediate. Detailed descriptions are given of 

 the intermediates. One individual showed sex reversal in the vegetative tissues of the bud. 

 It is concluded that sex reversal is probably due to a change in the physiological state of the 

 tissues, and that this might be most readily accomplished in the zygote. Of 100 Salix amygda- 

 loides trees, 9 intermediates were found, showing catkins with staminate flowers below and 

 carpellate flowers at the tip. At the transition zone, abnormal flowers were frequent. Sexu- 

 ality is considered to be quantitative: not a Mendelian character but a physiological condition. 

 The life cycle of Selaginella kraussiana is cited in substantiation. — H. D. Hooker, Jr. 



1576. Simbo, Ippo. Hompo-san nisan no chuei ni kwansuru kenkyu. Beitrage zur 

 Kenntnis einiger einheimischen Pflanzengallen im Japan. [Studies on some plant-galls in 

 Japan.] [Title in Japanese and German, text in Japanese.] Bot. Mag. Tokyo 33:1-12. 

 Jan., 1919— See Bot. Absts. 3, Entry 2895. 



BOTANICAL ABSTRACTS, VOL. Ill, NO. 5 



