THE ANTHOCEROTE^ 



137 



first divisions, as is the case in A. IcBvis. The first division 

 wall is, in most cases at least, transverse, and is usually followed 

 by a second similar one, before any longitudinal walls appear. 

 Then in the end cell two intersecting walls and the formation 

 of four terminal quadrant cells are often seen (Fig. 66, D), as 

 in other Hepaticae. Variations from this type are often met 

 with, and some of these are shown in the figures. Very 

 commonly a second cell is cut off by an oblique wall from the 

 germ tube subsequent to the first transverse wall, but this does 

 not, at least in the early stages, develop into a root-hair, the 



Fig. 66. — Anthoceros /itsi/on}iis (Aust.). Germination of the spores, X250. A shows a form with 

 very long germ tube ; in B there seems to be a definite apical cell. Fig. D, 2, is an apical view 

 of D, I. 



first root-hair being met with only after the young plant has 

 become a cell body of considerable size (Fig. 67). 



Whether the young plant regularly grows from a single apical 

 cell is difficult to say, but it seems probable, and numerous forms 

 like Fig. 66, B were encountered where there certainly seemed 

 to be a two-sided apical cell, such as occurs so often in other 

 Hepaticae. At a later stage (Fig. Gy , B) a single apical cell of 

 the form found in the mature thallus is unmistakably present. 

 By this time the marginal lobes that give this species its 

 peculiar crimped appearance begin to develop. They arise 

 close to the growing point, and grow rapidly be}'ond it, but do 



