112 American Fern Journal 



it should be known as Xotholaena laevis, a most inap- 

 propriate name given by Martens and Galeotti to 

 Mexican specimens in 1842. 1 



1912. 



Muhlenbergia 



Founded upon specimens collected from the rocky 

 slopes of Slavonian Canyon, Mule Mountains, Arizona, 

 August, 1911, by Leslie N. Goodding (No. 1004); 

 U. S. National Herbarium, No. 692,687. 



In his description of Notholaena hypoleuca Profes- 

 sor Goodding remarks that it "is most closely related 

 to N. Grayi, from which it differs in the very conspicu- 

 ous scales on the under side of the frond and several 

 other important features." However, a critical study 

 of the very ample type specimens shows that while 

 they differ somewhat from ordinary forms of N. Grayi 

 in their narrower fronds and more strict and narrower 

 pinnae, they arc identical in minute structural characters 

 of rhizome scal< in the sparingly ceraceous-pulverulent 

 covering of the upper side of the pinnae, in their dense 

 white-ceraceous covering beneath, and especially in 

 the structure, position, abundance, and color of the 

 scales upon the primary and secondary rachises and upon 

 the midveins of the segments beneath. These charac- 

 ters are important and serve to place Professor Good- 

 ding's plant definitely under Notholaena Grayi; where- 

 as the rather strict appearance of the pinnae and their 

 individual shape are characters which might readily 

 develop from unusual conditions of environment. The 

 plants have, in fact, a decided look of having grown in 

 an exposed situation. 



Notholaena Grayi u g originally described by Daven- 

 port 2 from specimens collected on "grassy slopes of 



"Mem. Acad. Bnix. 15*: 45. 1842 



'Bull. Torrey Club 7: 50. plalr 4. 1880. 



