560 SUMMARY OF CURRENT RESEARCHES RELATING TO 



petioles, and laminae, in the arrangement of the vascular tissues in the 

 stem and petioles, and in the kind of cortical tissue developed. The 

 scales which cover the stems and leaf-bases often show well-marked 

 differences in cell structure ; and important differences may be found in 

 the shape of the spores and paraph jses. He supplies a key to the species 

 of Radiovittaria, followed by revised specific descriptions. Vittarm 

 latifolia and V. Williamsii are novelties from Bolivia. 



Sumatra Ferns.*— E. B. Copeland publishes descriptions of the 

 characteristic structure of fourteen new species of ferns collected by 

 C. J. Brooks at Lebong Tandai, Benkoelan, Sumatra. He is of opinion 

 that the floras of Borneo and Sumatra are more closely related than 

 has hitherto been supposed. 



Bry ophy ta. 

 (By A. Gepp.) 



Morphology of Pallavicinia.f — D. H. Campbell and F. Williams 

 publish a morphological study of three species of Pallavicinia collected 

 in Java — namely P. {Mittenia) Zollinger!, P. radiculosa, and P. Levieri. 

 In summing up their results they say : 1. The thallus in the two 

 sections of the genus differs in two respects. In section Eupallavicinia 

 or Procumbentes the wings are one-cell thick throughout ; in section 

 Mittenia or Dendroideas the midrib merges gradually into the wings, as 

 is also the case in MorTcia and Calycularia. In Mittenia also there is a 

 marked difference between the prostrate, rhizome-like portion of the 

 thallus and the upright fan-shaped green branches ; and the formation 

 of adventitious branches from the rhizome is more common than in 

 Eupallavicinia. 2. The apical cell of the three Javan species is two- 

 sided, as in Aneura or Metzgeria. P. decipiens, a Ceylon species, has a 

 three-sided prismatic apical cell. In P. cylindrica the apical cell may 

 be two-sided ; and in P. Lyellii it is two-sided according to Leitgeb. 

 3. The hooked marginal teeth of Mittenia are probably comparable to 

 the leaf-like lobes of certain species of Symphyogyna, and, like them, 

 bear a definite relation to the segments of the apical cell. 4. The posi- 

 tion of the antheridia in the three Javan species studied differs somewhat 

 from the descriptions given by Schiffner. In P. {Mittenia) Zollinger i 

 they cover the whole surface of the midrib, as they do in Morkia. In 

 the Ceylonese P. decipiens they are said by Farmer to form a row on each 

 side of the midrib. In P. Levieri they occur in a row on each side of 

 the midrib, and not on its upper side. In P. radiculosa the groups of 

 antheridia are separated by sterile areas. 5. The development of the 

 antheridium is much the same in all the species— the usual type found 

 in Jungermanniales. 6. The spermatogenesis corresponds to that of 

 other Hepaticse. A delicate membrane separates the pairs of spermato- 

 cytes as in Fossombronia and Calycularia. A " Nebenkorper " may 

 perhaps be present, as in Marchantia and Fossombronia. Woodburn 



* Philippine Journ. Sci. (Bot.) ix. (1913) pp. 227-233. 



t Leland Stanford Junior Univ. Publications (California, 1914) 44 pp. (23 figs.). 



