484 The American Naturalist. [May, 
Peltigera. 
Pelt. canina (L.) Hoffm. On earth among moss; Jalapasco. (Smith 
64). 
Pelt. canina spongiosa Tuckerm. “On the ground in dense forest, 
lower slope of Mt. Orizaba.” Jalapasco. Altitude about 12,000 
ft. (Smith 65). Well characterized by the tufted fibrils and 
dense spongy nap of the under surface. 
Pelt. rufescens (Neck.) Hoffm.? On ground among moss; Jalapas- 
co. (Smith 66). Sterile and fragmentary. 
Pannaria. 
Pan. rubiginosa (Thunb.) Delis. Trees. Orizaba. (Smith 24). 
Pan. molybdaea (Pers.) Tuckerm. Trees. Motzerongo. (Smith 25). 
Sterile and fragmentary. 
Pan. molybdaea cronia (Tuckerm) Nyl. Trees. Cordova. (Smith 
26). 
The thallus agrees well with Tuckerman’s specimens, but the 
disks of the apothecia is redder and the spores are somewhat 
smaller. 
Collema 
C. aggregatum implicatum (Nyl.) Tuckerm. Branches of trees ; Ori- 
zaba. (Smith 16). 
C. aggregatum glaucophthalmum (Nyl.) Tuckerm. With the pre- 
ceding. (Smith 67). 
Leptogium. 
L. pulchellum (Ach.) Nyl. Trees, ete. Orizaba. (Smith 23). 
Spores larger than usual, and much like those of L. eres 
lum measuring 25-36 
8 -12 mic. 
L. tremelloides impresso-punctata Tuckerm. hb. Orizaba. (Smith 
19). 
_ Readily recognized by the impressed pits scattered over the 
upper surface. 
L. chloromelum (Sw.) Nyl. Rocks. Aguascalientes. (Smith 22). 
What is apparently the same thing was collected at Orizaba 
growing with moss on trees. 
L. bullatum (Ach.) Mont. Trees. Orizaba, (Smith 17). 
L. phyllocarpum (Pers.) Nyl. Trunks of trees. Orizaba. (Smith 
20). 
This species is very common and is represented also by several 
varieties. 
L. phyllocarpum isidiosum Nyl. With the species. (Smith 86). 
