4 



corymbose branches, and often occur in pairs. From fig. 6, 

 which represents a procarp, it will be seen that from a single 

 basal cell arise a number of short branches. In fig. 6, two branches 

 and a part of a third branch are seen, but the number is often greater 

 than three. Of these branches only two, ac and b of the figure, 

 are concerned in the production of the cystocarps. The other 

 branches grow into short filaments with nearly spherical cells, and 

 make their way amongst the filaments of which the frond is com- 

 posed, their general direction being parallel to the surface of the 

 frond- The branch ac bears at the tip the long hyaline trich- 

 ogyne which makes its way, usually more or less twisted, between 

 the corymbose branches to the surface. In the lower part it is 

 very much constricted where it passes into the bulbous tricho- 

 phore. Below the trichophore is the cell a^ which pushes out to 

 one side and becomes much enlarged. Its contents are darker 

 colored and more granular than those of the neighboring cells, 

 and I was unable to find that in any stage the bulbous portion 

 was separated from the smaller portion by a cell wall. The spo- 

 riferous masses do not arise from the cell a, but from the cell b, 

 which lies in a small branch close to that which bears the trich- 

 ogyne. The cell b has densely granular contents like those of 

 the cell a, and the branch is continued beyond b usually by two 

 smaller, more nearly hyaline cells. In fig. 5 the later develop- 

 ment of the branch of which b is the most prominent cell is 

 shown. The two terminal cells remain nearly unchanged, but 

 the cell b of fig. 6 divides into three cells, of which the central 

 one, b of fig. 5, is larger and more nearly spherical than the other 

 two which lie immediately above and below it These three 

 cells have dark colored contents. The lower cells of the branch 

 enlarge somewhat and divide in a direction parallel to the length 

 of the branch, and subsequently some of them develop into 

 short moniliform branches similar to those already described. 



The branch becomes curved, and the three dark colored cells, 

 which are sometimes increased to four by an additional cross- 

 division, are so arranged that the cell b, the real carpogenic cell, 

 lies at the apex of convexity; b is then divided into two cells 

 placed respectively on the concave and convex sides of the 

 branch. The cell on the upper convex side is next divided by 



