Download North American Species of Lactarius by L.R. Hesler PDF

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By L.R. Hesler

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Generally speaking, as far as the North American representatives of the genus are concerned, the shape of the stipe and its attachment to the pileus are not important taxonomic features. The diameter of the stipe near its apex is of some value, but as previously mentioned, should be considered in relation to texture and the width of the pileus to some extent. The occurrence of nanistic variants complicates the use of this character at the species level. Color. The color of the stipe is commonly described as concolorous with the pileus or paler.

This ratio is not out of line with that found in other genera such as Pholiota, Ga/erina, Mycena, and so forth. We have no record of the exact number of collections examined. It numbers in the thousands, but one examines many more collections than are placed in the herbarium. Some of these are simply discarded for lack of data and any truly distinctive microscopic feature which might be offsetting. Both of us have collected in Europe, and examined much Europeah material, thanks to the generosity of our European colleagues.

The portion to be sectioned is moistened with C 2 H sOH before being soaked in water to soften it for sectioning. 7. 10 percent "FeS04"-for testing chemical reactions on fresh specimens. 8. 05 gm. Cotton blue or Analine blue, 30 ml lactic acid. Introduction 21 Gently heat sections (especially of dried material) in the solution over an alcohol lamp to demonstrate certain cystidia, some hyphal incrustations, etc. 9. NH 40H-20 percent for fresh material. Study of Fresh Specimens In addition to the usual data which should be recorded on fresh specimens (size, shape, color and color changes, texture), certain features merit special attention in Lactarius.

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