76 Contributions to Western Botany. 
A3B2C2D2E. Meshes forming nests or obscure serrations—~ 
madidum, sometimes has the meshes arranged in serrations 
in the middle of the coat; peniusulare, meshes running ob- 
liquely and together making serrations, 10 by 2’. farther up 
6-10 by 1”, upper ones 3-4 by 2-1” and these vertical, on 
outer coat vertical and 2-3 by 4-2” and rectangular; fibril- 
lum, ends ot several meshes joined by a common line 
and much contorted into nests, or meshes: arranged like 
a labyrinth, becoming fibrous with age, 7 by 4’, or 4-6 by 3- 
#4”: Sanbornii may come here. 
A3B2C3D. Meshes neither narrow nor regular (except that they 
are nearly regular in acuminatum). 
A3B2C3DE. Mesh wallsnot crinkled, thick—Nevadense, meshes 
2-3 by 4-14”, toward the top they are nearly rectangular and 
vertical, 14-2 by 3-1”. 

A3B2C3D2E. Walls of the meshes minutely and dense! y crink- 
led, at least the vertical ones. 
A3B2C3D2EF. Meshes nearly regular, from hexagonal to rect- 
angular, most of them transverse; but nearly as high as 
wide, equally crinkled—acuminatum, meshes large, nearly 
hexagonal, much raised, 5-6 by 24-3” walls coarse, inner 
membrane with transversely-oblong, rectangular, fine mesh- 
es $ by 7-1” and walls straight, outer membrane with 
very irregular meshes like those of Bolanderi and not 
crinkled, 2-3 by 1’? and with delicate walls; Palmeri, meshes 
rather obscurely quadrangular, walls fine, 3-6 by 1-2’, ac- 
cording to Watson 2-3 by 4-1”. 
A3B2U3 D2E2F. Meshes never regular, the vertical walls deep- 
ly crinkled, the lateral walls much less so and often almost 
without waves; ribs with a few lateral branches, campanula- | 
tum, walls of meshes coarse, very deeply crinkled, “meshes 
2-3 by 1-13”, toward the top vertically oblong and 2-6 by 1”, 
flowers lead-purple, low plants with narrow leaves, growing 
