71 



there was none present at all. And so, altlio the Cladonia pre- 

 vented as rapid evaporation from the soil, the slightly greater 

 amount present under it was not sufficient to counterbalance 

 the greater hindrance to the repletion of water content during 

 light rains and dews on account of the absorinion iiy Cladonia. 



SUMMARY 



A study of moisture content in open areas and under Cladonia 

 mats in Cheboygan County, Michigan, during the summer of 

 1927 (an ordinary summer) supplies figures which show that 

 the soil under the Cladonia mat contains more moisture during 

 dry periods, but does not receive as much moisture from rain 

 and dew as the open. 



Cladonia ma\' absorb as much as 4.5 times its weight in 

 water before allowing moisture to pass to the soil beneath. 



University of Michigan Biological Station, 

 Cheboygan, Mich. 



Epidendrum conopseum, Ait. in Louisiana 



H. M. Denslow 



The note in Torreya concerning the finding of this species 

 in Louisiana is interesting but not quite accurate. It was col- 

 lected in Plaquemine Parish in February and in August 1915 

 by Miss Eunice Treuil. I have specimens in my herbarium. 

 This Epidendrum had been collected by B. F. Bush at White 

 Castle, Louisiana, July 30, 1897. There is a specimen of this 

 collection. No. 347, in the Herbarium of the New York Botanical 

 Garden. It may be expected in other places in Louisiana. 

 \\'hite Castle and Plaquemine are about ten miles apart and 

 not far from Baton Rouge. \\'est Feliciana Parish, from which 

 Miss Koch sends this report, is about forty miles northward 

 and to the east of the Mississippi River. 



These collections at long intervals and in three localities 

 emphasize the fact that species may be unknown, at least as 

 to their distribution, because we do not search for them. 



Chelse.\ Square, 

 New York City. 



