70 NEW YORK STATE MUSEUM 



one with another, {c ) Line drawings of spores and hyphae made 

 with the aid of a camera-lucida, and consequently comparable with 

 one another in point of magnification. Special attention has been 

 directed to the diameters of the hyphae, the presence or absence 

 of clamp connections, the character of the branching if present, and 

 the presence or absence of cross walls. Just how many of these 

 points will eventually prove to have diagnostic value is not known 

 at present. Unless otherwise stated, the hyphal characters given 

 apply to those of both the trama (dissepiments) and of the subi- 

 culum. They have been obtained from teased preparations as 

 described in the earlier article referred to. 



A word of explanation may not be amiss regarding the writer's 

 use of the terms trama, dissepiments and suhiculum. The first 

 two terms are used nearly synonymously but a more or less super- 

 ficial shade of meaning has been maintained. The walls of the 

 tubes, at the surface of the hymenium (that is, at the mouths of the 

 tubes) are designated as the dissepiments as they are seen wnth the 

 naked eye or by the use of a hand lens. Thus one speaks of the 

 comparative thickness or thinness, the color, or the pubescence of 

 these dissepiments. The interior of these dissepiments is designated 

 trama, and of course its structure is invisible except under the 

 microscope. Thus the writer speaks of the characteristics of the 

 hyphae of the trama, rneaning those hyphae (exclusive of basidia, 

 paraphyses or cystidia) of which the dissepiments are composed 

 and from which the hymenial elements are produced. The term 

 subiculum is used to designate that layer of hyphae from which 

 the tubes arise. There may thus be a subiculum before the tubes 

 are produced, and in most cases it persists after they are well formed, 

 as a thin layer separating the tubes from the substratum. 



The color terms used in the writer's Notes and Redescriptions 

 of the various species (except where credited to Peck) are those 

 of RidgAvay's Color Standards and Color Nomenclature, 1912 edi- 

 tion. In order to follow closely the exact shade of meaning of the 

 various terms used access to a copy of this book is a necessity. 

 In determining the colors shown by these fungi at present it is well 

 to bear in mind that specimens mounted on a herbarium sheet (as 

 many of Peck's types are) present a serious obstacle which may 

 express itself in discrepancies in applying the color terms of the 

 manual. This is because it is impossible to bring into close proximity 

 a given specimen on such a sheet and the representation of any 

 particular color shown in the book. Even if determined accurately, 

 ihe possibility of considerable color variation in the plants on drying 



