69 



rounded at each end, the archegonia are borne in a large cluster, 

 and the hairs are restricted to the margin. The male branches 

 likewise (Fig. 5) are considerably longer than is usual in the genus 

 but they are typical in other respects. No gemmae were ob- 

 served in the material examined. 



Fig. I. Metzgeria grandiflora Evans. Portion of thallus, ventral view, 

 X 50. Fig. 2. Cross section of costa and wing, X 60. Fig. 3. Female branch, 

 X 50. Fig. 4. Section through thallus and female branch, the wing on the left 

 showing one marginal hair, that on the right showing two, X So. Fig. 5. Male 

 branch, X 50. Figs. 1-4 were drawn from the type specimen ; Fig. 5, from No. 

 8524. 



The characters of the thai us (FiCxS. i, 2), which should be 

 especially emphasized, are the following: the strong convexity, 

 the cortical cells of the costa in two rows both dorsally and ven- 

 trally, the presence of hairs along the margins of the wings, and 

 the lack of hairs on the costa and on the surfaces of the wings. 

 In the first volume of his Species Hepaticarum* Stephani recog- 

 nizes three species of Metzgeria with hairs restricted to the 



* Bull. Herb. Boissier 7: 939- i899- 



