BOOK-XOTES, NEWS, ETC. 223 



as is the case with the cot3'ledon proper. When plumular leaves are 

 so treated no new laminse are regenerated. Further cotyledon leaf- 

 cuttings will produce roots from the base of the petiole, while 

 pluniular leaf-cuttmgs remain rootless. 



Mr. llobert Paulson gave an account of a joint paper by him- 

 self and Mr. Somerville Hastings, " On the Relationship between 

 the Symbionts in a Lichen," illustrating his remarks with a series 

 of thirty lantern-slides. A summary of the investigation may be 

 made by reference to Glndonia digitata, Hoffm., the lichen which 

 has been used as material for many of our preparations. This plant 

 grows at the base of trees in shady woods in Hertfordshire 

 and Essex as well as in most northern localities. In the southern 

 counties just mentioned it is luxuriant and fertile, though not 

 abundant. The gonidium is spherical, except when subject to 

 pressure from other gonidia. The diameter of fully-developed cells 

 ranges from 8 to 15 yL< ; the chloroplast in the mature gonidium has 

 an uneven surface ; after fixing and staining, minute reticidation 

 of the cytoplasm is evident ; the so-called pj^renoid is large and 

 central, and exhibits a distinct structure throughout the substance, 

 its diameter is roughly one-third that of the chromatophore ; a small 

 lateral body stains darker than the pyrenoid, it is very conspicuous 

 in many of the preparations surrounded by a very lightly stained 

 area. Twin gonidia frequently occur ; there is no vegative cell- 

 division of the gonidium; the increase in the number of gonidia 

 results from the formation of autospores, reduced zoogonidia ; there 

 is no penetration of gonidia by hypha?. 



The first paper in The Annals of the Phyfopafholoffical Socieig 

 in Japan, is devoted to a history of the development of Phyto- 

 pathology in that country and in China from the earliest times — • 

 insect pests were recorded in Chinese History in liOO B.C., and the 

 account of frost damage to plants was written in 48 B.C. Other 

 instances proving the practical interest taken in the subject at an 

 earl}' period are included in the brief survey. This paper and some 

 others are printed in English ; one, on Anthracuose of Euonymus, is 

 in German, the other contents are in Japanese. The pages printed 

 in Japanese type are closed to most of us, but the Journal, which 

 is issued from Tokio, should have a successful career in its native 

 country. — A. L, S. 



The Kew Bulletin issued in May (1918, n. 4) contains an 

 interesting paper on Hosa glutinosa by Mr. K. A. Rolfe, who shows- 

 that the plant " long cultivated and recently fignred (Willmott, 

 Rosa, p. 4G7) " under that name " does not agree with the original 

 R. glutinosa Sibth. & Sm.," of which an authentic specimen exists in 

 the National Herbarium and in the Sibthorpian Herbariimi at Oxford. 

 The same number contains a paper on "The Microconidia of Botrytis 

 cinrrea,''^ by Mr. W. B. Brierley ; a revision of Taxotrophis and 

 Balanostrcblus by Mr. J. Hutchinson, in which two new species of 

 the former genus are described ; and an account of the late Major 

 Sidney Miles T(ij)ping, who (1878-1JJ17) was killed near Ypres in 



