42 Physiologie. — Palaeonlologie. 



sichtliches Bild der gesamten Ph3\siologie, das in kurzen klaren 

 Zügen den Stand der einzelnen Fragen wiedergibt. Näheres Ein- 

 gehen auf den Inhalt des den meisten hinreichend bekannten Buches 

 erübrigt sich, die neue Auflage ist der beste Ausdruck des ihm 

 andauernd entgegengebrachten Interesses. Wehmer. 



Salisbury, E. T., On the Structure and Relationships of 

 Trigonocarpus Shorensis sp. nov. (Ann. Bot. XXVIII. p. 39 — 80. 

 pl. 4—5. 1914.) 



In a new species of Trigonocarpus, described as T. shorensis, 

 the sarcotesta is very well preserved. It has a lacunar structure. 

 with numerous secretorj^ sacs, and is bounded b}^ parenchj'^matous 

 tissue containing sclerised fibres. The outer vascular System con- 

 sists of six mesarch bundles occupying a peripheral position in the 

 sarcotesta, and alternating with the ribs of the sclerotesta. The nu- 

 cellus is limited internally bj' numerous mesarch bundles which 

 unite below to form a tracheal cup. The nucellus is free from the 

 testa and has a thick-walled epidermal laj^er and numerous secre- 

 tory sacs. It is considered that the integument "had its inception 

 in the lateral fusion of a whorl of six originally free members", 

 and its origin by diflferentiation of a homogeneous structure is sup- 

 ported by the transition which occurs between sarcotesta and scle- 

 rotesta. The comparison of T. shorensis with allied forms suggests 

 that it is in some respects primitive. W. N. Edwards. 



Scott, D. H., The Structure of Mesoxxlofi Lomaxii and M. 

 poroxyloides. (Ann. Bot. XXVI. 104. p. 1011 — 1030. 4 pl. 1912.) 



The author gives detailed descriptions of the anatomy of 2 

 species of Mesoxylon: M. Lomaxii, from the roof-nodules, and M. 

 poroxyloides from the seamnodules of Shore. They differ onlj^ in 

 minor points, and both species have a discoid pith with a persistent 

 outer Zone; very distinct centripetal primary xylem; dense wood outer 

 narrow rays; twin bundles of leaf trace convergent, and uniting as 

 they reach the pith; secretory sacs in the phloem; and outer cortex 

 Dictyxylon type. In most of their characters, including the histology 

 of the xylem , they agree with Cordaites, but the presence of cen- 

 tripetal xylem distinguishes them from that genus. Mesoxylon is 

 regarded as the last of a series of forms leading from Pteridosperms 

 to typical Cordaites. The genus is compared with 5 genera of Cor- 

 daitales or their allies recently established by Dr. Zalessky, and 

 of these Parapitys is considered to be nearest to Mesoxylon. 



W. N. Edwards. 



Seward, A. C, Lower Gondwana plants from the Golab- 

 garh Pass, Kashnir. Palaeont. Indica. (Mem. Geol. Surv. 

 India, N. S. IV. mem. 3. p. 1 — 10. pl. 1—3. 1912.) 



Descriptions of a few PermoCarboniferous plants, including 

 Glossoptei'is indica, Seh., Callipteridiutn sp.? Cordaites Hislopi (Bunb.) 

 and Psygmophyllurn Haydeni, sp. nov. The genus Psygniophyllutn 

 is compared with Ginkgophylhtrn, Ginkgo and Rhipidopsis. 



W. N. Edwards. 



