fo62 Morphologie und Teratologis. 



risc to gemmae which bear the antheridia, and also produce 

 new prothallia.' 



The sporophyte branches frequently and the leaves are 

 crowded. „The growing point appears as a fleshy green bulb 

 which is covered by brown scales having a structure peculiar 

 to the genus." The rhizome has a wedge-shaped apical cell, 

 and a concentric tubulär bündle." 



The roots are usually twice as numerous as the leaves. 



There are three kinds of leaves : the early rudimentarv 

 ones, the sterile ones, and the sporophylls. D. H. Campbell. 



CONARD, H. S., Fasciation in the Sweet Potato. (Trans, 

 and Proc. Bot. Society of Pennsylvania. Vol. I. No. 2. 

 p. 205—215. pl. XIX.) 



A record of observations in fasciation in Ipomcea Batatus. 

 The author found more or less fasciation in all plants of 

 sweet potato examined. The most striking form was the 

 ,,Ring-Fasciation" observed in about 1 J2°lo of the abnormal 

 stems. — A description is also given of the histology of the 

 normal and ring-fasciated shoots. Campbell. 



LAND, W. J. G., A morphological study of Thuja. 

 (Botanical Gazette. XXXVI. 1902. p. 249—259. pl. VI 

 —VIII.) 



A study of the gametophytes and embryo of Thuja occi- 

 dentalis. 



The development of the microsporangia was not studied. 

 The ripe microspore contains two nuclei — the tube nucleus 

 and that of the generative cell. During the growth of the 

 pollen-tube, a stalk cell and two generative cells are formed. 

 Both of the latter are functional. 



The archegonia are about 6 in number. A ventral nucleus, 

 which persists for a long time is formed. The neck-cells 

 ränge in number from 2 — 6. 



There are 8 free nuclei formed in the young embryo before 

 any ceil-divisions are developed. One embryo only is formed 

 from the e^. D. H. Campbell. 



Shaw, C. H., The comparative structure oftheflowers 

 in Polygala polygama and P. pauclfolia, with a review 

 of Cleistogamy. (Trans, and Proc. of the Botanical 

 Soc. of Pennsylvania. Philadelphia 1901. Vol. I. No. 2. 

 p. 122—149. Pls. XVI— XVII.) 



The author describes in detail the structure of both normal 

 and clcistogamic flowers in Polygala polygama and P. paucl- 

 folia. In the former there are two kinds of cleistogamic 

 flowers, those borne upon subterranean shoots and aerial ones 

 which have hitherto been overlooked. The latter are to some 



