139 



4. Ci.ADONiA TENUIS (Floerke) Harm. (25, p. 86). Atlantic: 

 Green Bank State Forest (1936) and Weymouth (1936). Ber- 

 gen: near Ridgewood (see Torrey, 30). Burlington: Chats- 

 worth (Darraii', 1935) and Martha (1937). Cape May: Cape 

 May Point (1935) and near Fishing Creek (1935). Cumber- 

 land: Sharp's Branch of Tuckahoe River (1935). Ocean: Col- 

 lier's Mills (1935) and Island Beach (1936). Passaic: Ring- 

 wood Mines (1935), Sussex: Kittatiny Mountain (1936). 



4a. Cladonia tenuis f. setigera (25, p. 87). Atlantic: 

 Elihu's Brook (1936). Cape May: Belle Plain State Forest 

 (1935), Cape May Point (1935), and Steelmanton (1935). 

 Passaic: Ringwood Mines (1935). Sussex: Kittatiny Moun- 

 tain (1936). 



4A.* Cladonia impexa Harm. (4, p. 386). The discovery of 

 C. impexa in New Jersey is of unusual interest. Although the 

 species is widely distributed in Europe, its range in the United 

 States is still incompletely known, and many of the specimens 

 which have been referred to it represent C. sylvatica or C. tenuis 

 instead. This is the case, for example, with the specimens from 

 Connecticut, listed by the writer in 1930 (see 26, p. 16). Aside 

 from the stations given below C. impexa is known in the United 

 States only from Maine, New Hampshire, and Massachusetts. 

 In the Cape Cod region, where it was first discovered by Mr. 

 Robbins, it occurs in considerable abundance. 



One of the most important distinctions between C. impexa 

 and its immediate allies is of a chemical nature. In C. sylvatica 

 and C. tenuis, for example, the bitter fumarprotocetraric acid 

 is present, whereas in C. impexa this acid is completely lacking. 

 The earlier writers depended upon a difference in taste in sep- 

 arating C. impexa from C. tenuis, but the application of para- 

 phenylenediamine, as recommended by Asahina, makes the 

 taste-test superfluous (see Torrey, 28, and Evans, 26, p. 25). 

 If fumarprotocetraric is present, as in C. sylvatica and C. tenuis, 

 this reagent gives an orange-red or brick-red color; if the acid 

 is absent, as in C. impexa, the reaction is usually entirely nega- 

 tive. In giving a negative reaction with paraphenylenediamine 

 C. impexa agrees with C. mitis, but the latter species is at once 

 distinguished by differences in the branching of the podetia. 

 The New Jersey material of C. impexa is referable to the fol- 

 lowing form : — 



