the sides converging somewhat in front. In vertical longitudinal section 

 it appears also triangular, but very much broader ( Fig. 8. D). A Croat- 

 section (Fig. 8, . ; AS that the lateral faces meet above and below 

 at an acute angle, so that the whole cell has somewhat the form 

 triangular wedge. \Mth the edges vely dorsally and ven- 

 t rally. The segments -MI the lateral faces are large, and ordinar- 

 ily are formed alternately right and left c a dichotomy occurs, how- 

 -m one segment may be cut off successively on one side, and 

 one of these j ie apical cell of the new branch, the 

 branching U-mg in the strict sense of the word not a true dichotomy. 



In h rvontal and vertical 1- d sections the arrangement of 



MI the apical cell is much the same. In 

 section the elongated, almost oval cell appears surrounded by the 

 shaped segnu- Fig. 8, A shows a cross-section of the 



thallu.s aprx shortly after the dichotomy is complete, and the 

 t of the new! The lobes a. a', arc the 



heridial scales, while the group of cells, b. is the 

 of the new branch. The divisions of the apical cell are not in quite 



ne as those of the original apex. 



Each segment cut off from the apical cell 6rst <! insversely 



into an adaxial and an abaxial cell. The latter cell divides only by walU 

 perpendicular lane of the thallus. and contributes to the wing or 



lamina of th which remains permanently but a single cell in 



thickness. The adaxial cell divides crosswise into a middle and an inner 

 cell. The former forms the sues of the midrib, and also from 



it arise the anthcridia. The innermost cell, by subsequent repeated lon- 

 gitudinal divisions, gives rise to the narrow cells of the conducting strand 

 iie midrib. These cells at first have dense 



later mostly disappear. A section of the young conducting strand is 

 shown in Fig. 7, B. 



The entire apex of the shoot, and the younger antheridia. are bathed 

 in mucil a 'i is secreted by two-celled glandular hairs developed 



from the Us of the young segments; and similar mucilage secret- 



ing hairs are also found among the antheridia. 



Pallavicinia Levieri Schiffner 



Pa//cniVirifYf I.rrifri. the third species considered h< -.ich less 



ted in 0. It fa quite common in the neighborhood of 



Tjibodas in Java, at an elevation of 1400-1500 metres, and material was 



collected at several points It has been reported from several other sta- 



