294: SUMiMAliY OF CUEKENT EESEAKCHES EELATING TO 



regarded as euryphotic, in contrast to P. hemionitis, which is apparently 

 stenophotic. They might also be regarded as euryxerophil, while P. 

 hemionitis is stenohygrophil. E. S. Gepp. 



Ferns of Papuasia. — G. Brause (Bugler's Boi. Jdhrluch, 1920, 

 56, 31-160). An account of the ferns collected by C. Ledermann 

 during his Sepik River expedition in 1912-13, and of previous collec- 

 tions in Papua, together with an enumeration of all species hitherto 

 recorded from Papuasia. This includes some 550 species comprised in 

 43 genera, and provides by far the most complete list of the rich 

 Papuan fern-flora yet produced. A. G. 



New or Interesting- Malayan Ferns. II. — C. R. W. K. van^ 



Alderwerelt van RosenburCtH {BuJl. Jardin Botan. Bnifenzon/, 

 1920, 2, 129-186). A supplement to the author's works on Malayan 

 ferns, with descriptions of fifty new species of ferns and ten new fern- 

 allies. A. G. 



Bryophyta, 



Gametophyte and Sex Organs of Reboulia hemisphserica. — 

 Arthur W. Haitpt (Bot. Gaz., 1921, 71, 61-74, figs.). An investi- 

 gation into the structure of this plant, with the following summary : — 



(1) Reboulia comprises a single polymorphic species, R. hemisphserica, 

 belonging to the Operculatge division of the sub-family Marchantioidete. 



(2) The thallus bears both smooth and pegged rhizoids and two-ranked 

 ventral scales without appendages ; it is differentiated into a dorsal and 

 a ventral region,- and grows by means of a single cuneate apical cell. 



(3) Air chambers are abundantly formed, and develop by centripetal 

 splittings ; they are sub-divided by secondary partitions, but contain 

 no chlorophyllose filaments. (4) The air pores of the female receptacle 

 are barrel-shaped, while those of the thallus and male receptacle are 

 made up of a single layer of concentric cells. (5) Reboulia is monoe- 

 cious (autoicous). The antheridial receptacle is sessile, and several 

 may be produced during the growing season ; but the formation of the 

 archegonial receptacle terminates apical growth of the thallus and 

 represents a definite branch system, as among the higher members of 

 the order. (6) The antheridia develop like those of the other 

 Marchantiales. (7) In the development of the archegonium the three 

 vertical walls follow the appearance of a transverse wall in the initial 

 cell, and further development is typical ; eighteen to twenty neck canal 

 cells are formed, but only four are present at the time of division of the 

 ventral cell. (8) Several growing points are organized in the female 

 receptacle from segments' of the apical cell of the thallus, and each new 

 apical cell comes to lie in a receptacle notch. Only one (rarely two) 

 archegonium is formed from the immediate segment of each apical cell. 



A. Gepp. 



Variations of the Gametophyte of the CephaloziellacepB.— 

 C. DouiN {Revue Generale de Botanique, 1916, 28. 251-6, 257-88, 

 800-20, 329-49 ; see also Bot. GentraJbl, 1918, 138, 239). The aim 

 of this paper is (1) to show the variations of the several organs under 



