iQoS] CURRENl 



59 



(6 spp.) and Phyllospadix (3 spp.); Posidonieae containing Posidonia (2 spp.); 

 Potamogetoneae containing Potamogeton (89 spp., i new, and numerous hybrids) 

 and Ruppia (i sp.); Cymodoceae containing Cymodocea (7 spp.) and Diplan- 

 thera (2 spp.); and Zannichellieae containing Zarinichelila (2 spp., i new) and 

 Althenia (4 spp.).— J. M. C. 



Giesenhagen's Lehrbuch. — The fourth edition of Giesexhagex's Textbook 

 oj botany s is not essentially different from the third edition, which was renewed 

 in this journal.'^ A few details have been modified, a few figures added, and 

 the text in general brought up to date. The most noticeable change is the pres- 

 entation of current theories, which many botanists believe to be out of place in a 

 textbook. The author, however, believes that important theories and pn)blems, 

 even though still lacking definite proof, are valuable if the presentation makes it 

 clear that they are only theories. — Charles J. Cil-uiberlain. 



Plants of Bolivia. — The fourth part of the enumeration of Bolivian plante 

 collected by ^Miguel Bang has been issued as a Bulletin of the Xew York Botani- 

 cal Garden. 7 The previous parts appeared in the Memoirs 0} the Torrey Botani- 

 cal Club in 1893, 1895, and 1896. The present part completes the enumeration 

 with the exception of Gramineae, and contains descriptions of 227 new species. 

 Three new genera are also characterized: Tournejortiopsis and Poedcr'wpsis 

 (both Rubiaceae), and Vassohia (Solanaceae). — ^J. M. C. 



Genera Siphonogamarum.— The eleventh fascicle of Dalla ToaiUE and 

 Harms's ^ list of the genera of seed-plants completes the work, the last entn- being 

 Zyz>-gium. There are included also title-page, preface, and list of famiKes (290 

 in number).— J. M. C. 



NOTES FOR STUDENTS 



almost 



Morphology of bryophytes.—Several studies of br>'ophytes come to han- 

 simultaneously. Dachxowski^ has been working again upon the much-studied 

 Marchantia polymorpha. The growth of the rhizoids, the origin of dorsiventralitr, 

 the plagiotropic position, the formation of reproductive organs, and fertilizat^ 

 have been reexamined. His conclusions are in part like those of previous in^-esti- 

 gators and in part a slight modification of them. He finds moisture the most 



5 GiESENHAGE-V, Dr. K., Lehrbuch der Botanik. Fourth edition with 561 

 illustrations. 8vo. pp. xiv4-463. figs. j6i. Stuttgart: Fr. Grub. 1907. 



*BoT. Gazette 37:225. 1904- 



7 RUSBY, Hexry H., An enumeration of the plants coUected in BoH%-ia by MlGtrL 

 B.VVG. Part 4. BulL N, Y. Bot. Garden 4:309-479- ^^7- 



8 Dalla Torre, C. G. de, and Harms, H., Genera Siphont^ainarum ad 

 Englerianum conscripta. Fasc. 11. pp. 801-921. Leipzig: Wilhelm Eng 

 1907. i/ 6 . 50, 



9 Dachnowski, a., Zur Kenntnis der Eatwicklun^Ph.-si<iogie von Mai 

 polymorpha. Jahrb. Wi^. Bot. 44:254-286. figs. 4- pi- 4- ^907- 



[mana. 



* 



