VOLUME LXMII NUMBER i 



THE 



Nfc\V vyRK 



Botanical Gazette 



JULY igig 



DEVELOPMENT OF PLUTEUS ADMIRABILIS AND 

 TUBARIA FURFURACEA' 



Leva B. Walker 



(with plates i-v and eight figures) 



Since there is no published account of the development of any 

 species of Pluteiis or Tuharia, it seemed desirable to the writer to 

 study representatives of these genera. Especially was this true 

 for Pluteiis, because in observing young stages it was difficult to 

 determine whether the h}'menophore was endogenous or exogenous 

 in origin. The prominent cystidia, also, and the unusual structure 

 of the trama of the gills, the filaments composing it consisting of 

 "long cylindrical cells converging as they descend in the gills and 

 often lying more or less crisscross at different angles of divergence," 

 as mentioned by Atkinson (2) in his description of Leptonia seti- 

 ceps,^ offered an interesting field for investigation. Atkinson has 

 found this structure of the trama to be characteristic of all species 

 of Pluteus and Voharia examined by him. 



While the various species of Pluteus are abundant in most 

 regions, the fruit bodies are usually formed singly or with only a 



' Contributions from the Department of Botany, University of Nebraska, New 

 Series, No. 27. 



^Leptonia seticeps .\tk. (Jour. Myc. 8:116. igoz) —Pluteus seticeps Atk. MSS. 



Atkinson came to consider this form a true Pluteiis. At the time he described it he 



ro placed it in Leptonia because of the slight attachment of the gills to the stem. His 



^ extensive studies on the structure of the Agaricaceae have shown that structurally it 



■" — agrees in all ways with Pluteus and not with Leptonia. 



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