-87- 



thick felt of radicles. The leaves are usually lanceolate to lance- 

 subulate, with a concave base and a very strong costa extending 

 nearly or quite to>the apex of the leaf, or even beyond. Fig. 4 

 shows the leaf in cross section and also shows the narrow lamellae, 

 which are found on the lower side of the costa instead of the upper, 

 as in the hair-caps. These lamellae are often very strongly toothed. 

 A section of the leaf is not necessary in order to see the lamellae 



DiCRANUM SCOPARIUM. 



Fig. I, Plant natural size, the fruit terminal, becoming lateral by the growth 

 of the stem; 2, single leaf enlarged; 3, part of base of leaf, showing the 

 enlarged cells at basal angles, and the porose cells above; 4, cross- 

 section of leaf showing the ridges on the back of the vein; s, apex of 

 leaf enlarged; 6, antheridial bud; 7, perichaetial leaves, sheathing the 

 base of the seta; 8, capsule with the calyptra and lid on; 9, peristome 

 showing two teeth divided more or less irregularly to the middle. 



^[From Mrs. Britton's article In the February, 1895. Observer. By permis- 

 sion]. 



