The Polytrichacea of western North America, by T. C. Frye, drawings by Elsie K. Waddingham ...

Abstract

There is great confusion in the taxonomy of our western mosses on account of the duplication of names and the naming of species from sterile specimens or single collections. Systematic work on them is much needed. To show the way, a single family, the Polytrichaceae, was studied from type material and accessible collections. In the keys in this paper the characters separating the genera or species are given for all, thus making a comparison. So often one wants a comparison rather than a description, that it is hoped this will prove of value to those using this paper.

Modification of jet substructure in heavy ion collisions as a probe of the resolution length of quark-gluon plasma

“…This can be done in a number of ways; we shall employ the iterated Soft Drop (ISD) procedure of Ref. [75]. In the ISD procedure, the softer of the two subjets found previously is recorded and removed, and the Soft Drop procedure is then applied anew to the harder of the two subjets.…”

Soft drop groomed jet angularities at the LHC

“…The grooming procedure discussed in this work is soft drop declustering [3] which has several advantages from a theoretical point of view [4]. The soft drop groomed jet mass distribution was calculated in [5,6,7] and the corresponding LHC measurements from ATLAS and CMS can be found in [8,9]. A good agreement between theory and experimental data was obtained for the shape of the jet mass distribution.…”

Factors Controlling the Distribution of Douglas Fir in Semi‐Arid Regions of the Northwest

“…It has been pointed out, as the result of observations in different localities, that Douglas fir is confined largely to north facing slopes, while south slopes are practically without forest trees except where out-cropping rocks help to furnish sufficient shelter and moisture for the establishment of seedlings ( 2,7,10,12). It has been pointed out, as the result of observations in different localities, that Douglas fir is confined largely to north facing slopes, while south slopes are practically without forest trees except where out-cropping rocks help to furnish sufficient shelter and moisture for the establishment of seedlings ( 2,7,10,12).…”

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The aim of the present investigation was to obtain quantitative data on the factors which control the distribution of Douglas fir (Pseudotsuga taxifolia) in semi-arid regions of northwestern United States. It has been pointed out, as the result of observations in different localities, that Douglas fir is confined largely to north facing slopes, while south slopes are practically without forest trees except where out-cropping rocks help to furnish sufficient shelter and moisture for the establishment of seedlings ( 2,7,10,12). In that part of Idaho adjacent to the Spokane region in Washington, included in Merriam's Arid Transition Area (5), the Douglas fir grows chiefly on the north and northeast slopes.

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