Southern Park Mountain Distriet. 561 
Besides the sinter and travertine formed by algae, which remove in the case of the carbon- 
ated waters, containing calcium en Ca(HCO;3), in solution, the gaseous carbon dioxide, 
a see calcium carbonate, CaCO3, we have stalaetites produced by the growth of several 
Gloe sa Aline Schlzothrtz Norge Fe cococcus aeruginosus and Phormidium 
ed a n interesting ace e formation of these stalactites has been 
0 
given to us by Toiksäie TILDEN, who vis er 2 an stone Park to study the thermal algae. 
In the tepid waters of the overflow eier for example Specimen Lake, which is produced 
by the water from Black Sand Pool, nd extensive diatomaceous beds formed by the 
growth of numerous ae The water of these areas has encroached on the timber, killin 
the trees, which stand as bare poles from the treacherous marshes. It is known that these plants 
deposit silica, as a vs test, or frustule, and it is thus by the activity of the protoplasm that the 
silicious diatomaceous earths are formed. Samples of this material show the et = Den- 
ticula valida, bi forms the bulk of the material, Dentic a elegans, Naricula major, N, viridis, 
er Argus and E. Hyndmannii, Cocconema cymbiforme, Köhnaklins gibberula and Mastigloia 
Smithii. 
4. Grassland and Rocks. 
Park Formation. The open parks in the Yellowstone country are covered 
with grasses which form a conspicuous element of the vegetation. Such 
grasses as Phleum alpinum, Sporobolus (Vilpa) asperifolius, Agrostis scabra, 
Muhlenbergia mexicana, Calamagrostis canadensis, C. confinis, Stipa comata, 
Agropyron divergens, A. caninum, Stipa viridula, Koeleria‘ cristata, Melica 
bulbosa, Festuca ovina, Bromus breviaristatus and such sedges as Eriophorum 
polystachyum, Carex rigida, C. Famesü, C. ee C. aquatilis, C. Rayn- 
oldsii, C. leporina, C. tenuirostris are foun 
On the elevated grassy slopes set in the uniform forest growth occur Caltha leptosepala, 
Oxytropis nana, Astragalus Kentrophyta, Erigeron ursinus, Aplopappus suffruticosus, Senecio am- 
plectens. At lower elevations, the same character of country is set off with eopses of Abies grandis 
and such plants as Ribes viscosissimum, Peucedanum leiocarpum, Ligusticum scopulo 
caerulea, Aster conspicuus, A. integrifolius, Senecio triangularis, S. andinus eracium 
Gaultheria myrsinites, Orthocarpus Parryi (= O. pallescens), Echinosperum "Aolerum, Spiranthes 
Romanzoffiana, Fritillaria em Calochortus EINFCHTDES, and Botrychium simplex occur and give 
character to the vegetation 
‚Plants to reach these war from below must make their way up narrow canyons or else 
over passes and this peculiar BOBHE, leads to a pauchy of plants from Ionen altitudes and an 
folia, &c. Pentstemon secundiflorus occurs in such moist places as also Potentilla fruticosa?). 
Rocky Hills. The broken parts in the Uintah Mountains contain on the 
border, small groves of Pinus Murrayana in which Astragalus alpinus, 
Pachystima myrsinites, Arctostaphylos uva-ursi, Funiperus communis var. 
occur. The open rough hilly parks according to PAMMEL°) contain Potentilla 
ı) TwEEDY, FRANK: Flora of the Yellowstone National Park. 
2) RAMALEY, Francis: Remarks on the Distribution of Plants in Colorado, East of the Divide. 
Postelsia. 1901 p. 41. 
3) 1, L. H.: Some ecological Notes on the Vegetation of the Uintah Mountains. 
Contributions Botanical Department Iowa State College of Agriculture and Mechanic Arts. No 22. 
Science X: 57—68 
Harshberger, Survey N.-America. 36 
