shaded situations. I found it only at altitudes of 5000-5500 feet. Wherever 

 found, it often formed patches covering many square inches. Of course, both 

 Cora and Dictyonema interested me, both being Hymenomycetous Lichens; but 

 Sticta, and its close ally Lobaria, and Leptogium, also attracted my attention, 

 because of their number and variety of forms. They grew, too, in a variety of 

 situations. It was noted, too, that the difference in form of some species was due 

 to the difference in habitat. Sticta damaecornis growing in deep shaded places 

 was inclined to have very narrow thalli, in more sunny places the thalli were 

 broader. 



I have already stated, that in the deep shaded ravines, almost no Lichen life 

 could be discovered, although there was still enough light for many species of 

 Hepaticae. But, of all Lichens, Sticta and Leptogium seem best able to adapt 

 themselves to grow in the deep shade. Both have a most interesting way of ac- 

 commodating themselves to the small amount of light that finds its way down to 

 them, by extending their narrow thalli horizontally outward from the tree trunk, 

 and growing more or less spirally around it, instead of lying closely appressed to 

 it. This peculiarity of growth is, of course, not confined to Sticta and Leptogium, 

 some Hepatics and Mosses behaving in the same way ; and the Leptogium ob- 

 served was growing on a moss. 



How many species of Sticta I collected, I am not yet prepared to say. It 

 may be only four, it may be twice that number, the variety of shape being only 

 due to difference in habitat and environment. Sticta aurata and Sticta crocata 

 were equally plentiful and were found in almost similar situations, always on tree 

 trunks, and always in sunny places. S. damaecornis, and S. tomentosa grew in 

 shady places, the latter on the ground and the former on tree trunks, varying much 

 in width of thalli, according to the amount of illumination. 



Of Lobaria, four different species were found; L. corrosa, L. crenulata (?), and 

 L. quercizans, found on tree trunks, and L. dissecta (?), which grew on moss- 

 covered rocks. 



Species of Sticta and Lobaria were observed almost everywhere. Not a 

 walk could be taken without finding one or more of the species covering the 

 ground, some rocky ledge, or tree trunk. Not so however, with Parmelia, which 

 was very much less common, notwithstanding the number of different species 

 found. It was found much less frequently, was generally restricted to the tree 

 trunks, and its growth was inclined to be dwarfish. The most important species 

 "of Parmelia found, are the following: P. cetrata, possibly two varieties; P. cnsti- 

 fera, P. perlata, P. sinuosa, P. laevigatula, P. pilosella. 



Species of Leptogium were found very frequently, eight, or perhaps more, 

 different species having been collected. They were, of course, at their best im- 

 mediately after a rain, when beautiful specimens could be found even in places 

 where one previously had failed to observe them, because the rain had swollen 

 up the thalli, and had changed a more or less shrivelled up and perhaps unsightly 

 crust into a thing of beauty. How wonderfully prominent would then their 

 fruits stand out! It is hard to say which of these species impressed me most, 



