— 6S— 



BAZZANIA. 



Bv Wm. C. Bardour. 



Though our first hepatics were of the distinctly thallose forms, and pos- 

 sessed nothing whatever which could be denominated " leaves," and though 

 to follow a natural order, we would be confined to similar forms for some time 

 to come, it has been thought wise, in the first few papers, to follow perhaps 

 more the order in which the student would notice them. 



Hence it is that we now leave the thallose forms like theMarchantia and 

 the Gonocephalum and consider one of the largest and most conspicuous of 

 the "leafy" (foliose) forms— Bazzania trilobata S. F. Gray. 



>\V2 



B 



W CB 6.«A- 



A. Plant slightly magnified. B, (i) Part of female plant with cap- 

 sule. (2) Capsule open. C, Perianth and involucre. D, Leaves enlarged; 

 underleaves; antheridial branch on male plant. E, (i. 2). Elaters. (3). 

 Spores. F, Cells from leaf apex. 



This species is very widely and commonly distributed through the east- 

 ern section of the United States and Europe. It occurs on moist hillsides 

 and in wooded swamps and its appearance is so distinctive that, once it is 

 recognized, it is impressed upon the student's memory and is at once 

 known thereafter. The plants are frequently from two to three inches in 

 length and branch dichotomously two or three times. 



The leaves of most of the foliose hepatics are arranged so as to lie nearly 

 flat in two ranks (complanate ); but while in many mosses the leaves 

 may be secund, in the hepatics this form is rare. In addition to these 

 two rows of leaves there is typically a third row on the under side of 

 the stem, known as amphigastra or "underleaves." 



The underleaves alternate with the others, thus making a three-ranked 

 spiral. In some genera the spiral turns from left to right, and the 

 upper margin of each leaf is covered by the lower margin of the one 

 next above. This method of overlapping is known as the succudot^s arrange- 



