56 THE PLANT WORLD 



August 23d I secured a sod of this plant six by four inches. 

 Near this Pellta epiphylla forms beds a yard square. Every 

 thallus tip bears at this season a cup of archegonia. A hand 

 lens reveals the swelling embroyos. Slightly prominent an- 

 theridia are plentiful on the backs of the bright clear green 

 thalli. A quarter of a mile down stream Fegatella conica 

 is equally plentiful, and with many antheridial excrescences. 

 While this particular region must be exceptionally rich 

 in these interesting plants, I have seen Anthoceros almost as 

 plentiful — acres of it — in Chester Co., Penna., near Down- 

 ington, and large quantities in the vicinity of Baltimore, Md. 

 And in the middle of Iowa we collect the three horned liver- 

 worts in company with Marchantia polymorpha. I am con- 

 vinced, therefore, that the Anthocerotes should be reckoned 

 amoung our commonest plants. If so, this is very fortunate, 

 because of their great biological and phylogenetic importance. 

 — Grinnell, Iowa. 



LIST OF COLORADO TREES. 



By Mrs. Cora Bennett. 



Last year, at the suggestion of Professor Francis Rama- 

 ley of the University of Colorado, the writer prepared a 

 tabulation of the distribution of some Colorado trees. In 

 doing this work a list of all the trees known in the state was 

 prepared. This list may be of interest to western students 

 but more particularly to visiting botanists who are wont to 

 think of Colorado as being very poor in tree species. All of 

 the trees except two in the accompanying list are given in 

 Rydberg's Flora of Colorado, but they are not separated out 

 so that they can be found. A few species given by Rydberg 

 are omitted here as probably they do not occur in the state. 



Plnus aristata Englm. Foxtail Pine. 



Plnus scopulorum Greg. (Engelm.) Lemmon. Rock Pine. 



Pinus murrayana Oreg. Com. Lodgepole Pine. 



Pinus edulis Engelm. Plnyon Pine. 



Pinus flexilis James. Limber Pine. 



Picea parrayana (Andree) Sarg. Colorado Blue Spruce. 



Picea engelmanni (Parry Engelm. Engelmann Spruce. 



Pseudotsuga mucronata (Raf.) Sudw. Douglas Spruce. 



Abies lasiocarpa (Hook.) Nutt Balsam Fir. 



Abies concolor Lindl. White Fir. 



