276 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Bry ophy ta. 



(By A. Gepp.) 



Inflorescence of Cephaloziellacese.* — Ch. Douin, discussing the 

 nature of the inflorescence of the Cephaloziellacere, maintains that the 

 habitual sterility of certain species does not prove that they are dioicous. 

 He explains some causes for such sterility. He finds the four following 

 different kinds of inflorescence in the group : — synoicous, paroicous 

 (3 sorts), autoicous, dioicous. He discusses the specific value of the 

 inflorescence, the development of the andrcecium, and the best methods 

 of determining the nature of the inflorescence, adding some rules for 

 drawing conclusions from a hasty examination of the plants. 



Cephalozia.f — V. Schiffner publishes the result of some studies on 

 Cephalozia. In the first note he clears up the confusion which has 

 haunted Jungermannia catenulata Hiiben. An examination of the type 

 and of numerous other specimens shows that Hiibener's original diag- 

 nosis is incorrect in certain important points, and that his plant is 

 identical with ./. reclusa Tayl. and Cephalozia serriflora Lindb. 

 G. catenulata Lindb. is not the same species, but equals G. leucantha 

 Spruce. The complicated synonymy of these and allied species is 

 critically discussed and set in order ; and the true structure of Hiibener's 

 type is figured. The second note contains a description of G. spiniflora, 

 a new species, hitherto confounded with G. macrostachya Kaal. The 

 essential points of difference are made clear. 



Treubia insignis.| — C. Griin publishes the results of his investiga- 

 tion of Treubia insignis. In his summing up he describes the vegetative 

 plant, and the five different sorts of tissues which compose it. Myco- 

 rhiza occurs in the layer of starchy tissue. Mucilage organs are found 

 in the form of papillae, as mucilage cells, and as multicellular, more 

 highly differentiated hairs, the latter only in the archegonial inflorescence. 

 Treubia possesses a three-sided pyramidal apical cell, from the right and 

 left segments of which are formed mainly the leaf and the dorsal scale. 

 The archegonia stand, about eight to ten in number, in the angle of the 

 dorsal scale. Of the archegonia of a given inflorescence only one 

 develops into a sporogonium. This is described in detail. The number 

 of haploid chromosomes is 8, the diploid 16, thus agreeing with Fossom- 

 bronia and Pallavicinia. With the latter genus there is also a similarity 

 '.n the manner of division of the tetrads. The opening of the capsule 

 apparently takes place by a dehiscence into four valves, the capsular wall 

 being of three layers, the two inner of which are variously thickened 

 with spiral bands, etc. Asexual reproduction is effected by means of 

 3- to 4-celled gemmae. 



* Rev. Bryolog., xl. (1913) pp. 81-7. 



t Hedwigia, liv. (1911) pp. 311-27 (1 pi. and figs.). 



\ Flora, vi. (1914) pp. 331-92 (3 pis. and figs.). 



