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Cystocarpic fronds are sometimes similar in shape to tetrasporic 

 ones, but in other cases, their branches are much more elongated, 

 often appearing to unaccustomed eyes to be entirely different 

 from the typical plant. 



The innermost layer of the wall of frond is composed of 

 loosely set and longitudinally running filaments to which so-called 

 gland-cells are wanting. Outside of this layer is occupied by a 

 thick layer, composed of internally larger and externally smaller 

 cells, which is covered by a layer of anticlinal, cortical ceils. At 

 constricted places, there are transverse septa which are composed 

 of an aggregation of irregularly arranged roundish and elongated 

 cells. These septa divide the tube into various compartments 

 and are connected with the inner wall of the intermediate layer 

 by filamentous cells. There are no longitudinally running fila- 

 ments which unite septa to each other, as it is the case with 

 Champia. 



Tetrasporangia are densely aggregated into roundish sori 

 which are scattered over segments of ramuli and sink beneath 

 the surface of frond, forming roundish depressions. They are 

 developed from cortical cells and bulge in towards the cavity of 

 frond. They are surrounded by a beautiful network of infra- 

 cortical cells which become filamentous there. They are roundish 

 or elongated and are triangularly divided. 



Cystocarps are globular, and sessile, and single or 3-4 or 

 more are aggregated at the sides of branches and branchlets. 

 Pericarp is thickly cellular and is composed of two layers of 

 cells. The inner layer is composed of a few stellate and anas- 

 tomosing cells, and the outer, of ro ndish ones which are 

 arranged in anticlinal rows. Neucleus is simple and globular, 

 being made of spore-filaments which are densely branching in 

 paniculate manner from a large pedicel-cell. The central cell, on 



