Bryophyten. 651 



Sarconennan gJaciale, Brytim argenteinn, B. antarcticum. But Ihe 

 fourth constitutes a new record for the region; it is a dwarfed form 

 of Dicranella Hookeri = Angstroemia Hookeri C. Müll. =r Anisothe- 

 cium Jamesoni Mitt. (in part), a moss previously known from the 

 Magellan region, South Georgia, Kerguelen and Heard 

 Island. A. Gepp. 



Cavers, F., The inter-relationships of the Bryophyta. 

 (New Phytol. IX. 5. p. 157-186. Figs. in text. 1910.) 



The author gives a comparative account of the chief morpholo- 

 gical characters of the Marchantiaceae group by group. In the first 

 group, Astroporae, are the genera Clevea, Sauteria, Peltolepis, and 

 Gollaniella. In the second group, Operculatae, are Plagiochasnia, 

 Rehoulia, Grimaldia, Massalongoa, Fmihriaria, Neesiella, Cryptomi- 

 triiini. In the third group, Compositae, are ExormothecUj Fegatella, 

 Wiesnerella, Dumortiera, Lunularia, Preissia, Bucegia, Marchantia. 

 Having discussed the points of difference and similarity exhibited 

 by these genera of Marchantiaceae to one another, the author con- 

 siders the phylogeny of the tribe Marchantiales, calling attention to 

 the general advance that can on the whole be traced, as we pass 

 upwards from Riccia towards Marchantia, in the eiaboration of the 

 vegetative organs, the aggregation of the sexual organs into game- 

 tophores of increasingly complex Organisation, and a progressive 

 diiferentiation of the sporogonium. And he broadly sums up in a 

 pedigree table his views as to the relationships of the genera of 

 Marchantiales to one another. Starting with the hypothecial Sphaero- 

 riccia of Lots}'^ the line runs to Riccia and Tessellina. After Tessel- 

 lina it bifurcates and leads to Corsinia and Boschia. The Corsinia 

 brauch divides into the two groups Astroporae and Operculatae. The 

 Boschia brauch on the other hand throws off the Targionieae and 

 passes on to the Compositae group. A. Gepp. 



Cavers, F., The Inter-relationships of the Bryophyta. 



(New Phytol. IX. 6/7. p. 193—234. Figs. in text. 1910.) 



The author publishes a Supplement to his previous paper in the 

 same periodical on the Phylogeny of the Marchantiales, and gives 

 an acconnt oi Monoselenitun tenerumGrifi. , an Indo-Chinese hepatic 

 recently investigated by Goebel. Monoseleniitm is a genus that 

 shows a reduction of its organs; its thallus is without air-chambers 

 (as in Monoclea)\ its sporogonium recalls that of Corsinia or of 

 Boschia and is characterised by containing sterile cells and rudi- 

 mentary elaters; the sexual receptacles are of the "Composite" type 

 and though usually terminal on a thallus-lobe may become shifted on 

 to the dorsal side of the thallus, recalling Clevea and Plagiochasnia. 

 Monoselenium thus gives considerable support to the view that the 

 Marchantiales constitute a descending series of reduction-forms, 

 starting from a type like Marchantia and exhibiting in Riccia, not 

 a primitive form, but the lowest and most reduced member of 

 the series. 



Dr. Cavers then passes on to discuss the inter-relationships of 

 the anacrogjmous Jungernianniales, which he divides into four 

 families he examines, treating the constituent genera one by one. 

 In the first family, Anenraceae, he places Aneura, Metsgeria, Podo- 

 initriian and Umbraculum ; the second Blyttiaceae, Blyttia, Mörckia, 



