338 SUMMARY OF CURRENT RESEARCHES RELATING TO 



of the genus. Bodies resembling centrosomes occur in the cells of the 

 antheridiurn, and persist, and later become blepharoplasts. The develop- 

 ment and cytology of the antherozoids, spore-mother-cells, and spore 

 are described. 



Genus Scapania.* — K. Muller has completed and published an 

 exhaustive monograph of this difficult genus. The work, which has 

 taken years to carry out, is divided into two parts, the general and the 

 special part. Preceding these is a list of bibliography and exsiccataa 

 quoted in the book. The general part opens with a list of herbaria, 

 collections, and published sets examined by the author, and the names 

 of the specimens represented therein. Then follows a detailed dis- 

 quisition on the geographical distribution of the genus all over the 

 world, ending with the results presented in the form of tables. The 

 special part deals with the systematic side of the work, and after giving 

 the synonymy and diagnosis of Scapania the author describes the mor- 

 phology of the genus under the headings of habit, stem, leaves, 

 areolation, cuticle, sexual organs and their envelope, etc. The species 

 are divided into three main groups : 1, Perianth compressed ; 2, 

 Perianth unknown ; 3, Perianth not compressed. The author remarks 

 that the best systematic character of Scapania is the form of the leaf- 

 lobes and their proportionate size. Each species is treated with the 

 utmost detail from a descriptive, critical, and geographical point of view. 

 Six new species are described. The book is illustrated by 52 large 

 quarto plates, containing figures of habit and structure of each of the 

 65 species recognised. 



Regeneration of Liverworts.f — Anna Berkovec gives the results of 

 her investigations of the regeneration of liverworts. For this all liver- 

 worts have a remarkable capacity. There is a strong correlation between 

 the growth of the potential growing point and the formation of adventive 

 shoots which arise after a wound. The fewer the potential growing 

 points, the greater the capacity for producing new thalli. These latter 

 arise most frequently from superficial cuts near the apex or along the 

 thallus, or even near the base ; there is therefore no polarity. They 

 may also arise from uninjured tissue above or below the thallus. The 

 adventive shoot has at first a radial structure which soon becomes dorsi- 

 ventral. The regenerating portion of thallus determines the plane of 

 dorsiventrality of the new shoot. The author describes her apparatus 

 and methods. 



Chyzer, K. — Adatok eszaki Magyarorszag, kiilonosen Zemplenmegye es Bartfa sz. 

 kir. varos florajahoz. (Additions to the flora of North Hungary, especially the 

 districts of Zemplen and Bartfa.) 



[Contains a list of 48 mosses and 3 hepatics, revised by Magocsy-Dietz.] 



Magyar Bot. Lapok, iv. (1905) pp. 308-10. 



Gyorffy, I. — Hypnum arcuatum. Plagiopus (Ederi. Pterygoneurum cavifolium. 



[Notes on these three mosses as occurring in Hungary.] 



Tom. tit., pp. 339-40. 



* Nov. Act. Acad. Caes. Leop.-Car. Germ. Nat. Cur., lxxxiii. (Halle, 1905) 312 

 pp., 52 pis. 



t Bull. Internat. Acad. Sci. Boheme Prague (1905) 19 pp., 1 pi. 



