I70 Alexander W. Evans, 



female, bisexual with the antheridia at the base and the archegonia 

 toward the apex, and bisexual with the sexual organs in the 

 reverse position. In two instances proliferations of a female 

 inflorescence have been observed. One was in the form of a second 

 inflorescence ; the other in the form of a long branch bearing two 

 sexual branches and also sterile branches. A male inflorescence 

 (Fig. 9, E) is about i mm. long and 0.6 mm. wide ; it develops an 

 obliquely spreading wing two or three cells wide and irregularly 

 crenulate from projecting cells. As a rule only six to eight anthe- 

 ridia are present, and the openings of the antheridial chambers are 

 separated by two rows of cells, some of which often project slightly 

 above the average level. The partitions between the chambers are 

 occasionally incomplete, and antheridia in consequence may be in 

 contact with one another. 



The female inflorescence (Fig. 9, F) is about as long as the 

 male, but the wing is three to five cells wide and irregularly split 

 up into short lobes or cilia, supplemented by similar but still shorter 

 structures among the archegonia. From four to eight archegonia 

 are usually developed. The bisexual inflorescences are no larger 

 than the unisexual and comljine their features, the abrupt change 

 in the character of the wings being especially striking (Fig. 9, G). 

 It is unfortunate that the "calyptra" and sporophyte of R. diver- 

 siflora are still unknown. 



Bisexual branches in the genus Riccardia have already been 

 demonstrated in two species: R. androgyna Schiffn. of Java (20, 

 p. 44) and R. insularis Schiffn. of the antarctic islands St. Paul 

 and New Amsterdam (21, p. 66, pi. 6, f. 7-7). In R. androgyna 

 these branches bear antheridia at the base and archegonia above, 

 while in R. insularis they bear archegonia at the base and antheridia 

 above. In addition to the bisexual branches R. ayidrogyna shows 

 male branches only, while R. insidaris shows both male and female. 

 The presence of all four types of inflorescence in a single species is 

 the most remarkable feature of R. diversiflora. 



Even in its vegetative features R. diversiflora differs from R. 

 autoica in several important particulars. It lacks, for example, 

 the distinctive photosynthetic systems of R. autoica, in which the 

 short branches are sometimes so crowded together that they 

 overlap ; and it lacks also the well-differentiated stolons, which are 

 often if not invariably found in the older species. The lack of 



