16 THE AGARICACEAE OF MICHIGAN 



this report, was foimd by the exploration of the white pine lauds 

 around New Richmond. None of the virgin pine forest is left at 

 this place, but second growth groves still yield characteristic fungus 

 forms. Many of the sand plains at New Richmond remain uncultivat- 

 ed and are covered with scrub oak ; here, however, the pine flora is no 

 longer in evidence except as isolated species. Alternating with the 

 sand plains are clay lands originally covered by hemlock and hard- 

 woods. In the ravines bordering the river bottoms, there are still 

 remnants of these forests and these yield a flora which is 

 comparable with that of Bay View, Marquette, and wherever such 

 forests exist. The flora of the tamarack bogs seems to be very 

 similar throughout the state. In the tamarack bogs around Ann 

 Arbor, we find the same species which are found in the northern 

 bogs. 



It is still an open question to what extent the formation of 

 mycohiza may influence the distribution. If certain species can 

 thrive only within reach of the roots of the beech tree for example, 

 tli en those species are to be looked for only in beech woods. Evi- 

 dence, however, is at hand to show that some species can 

 form mycorhiza on a number of hosts. Every collector has ex- 

 perienced the feeling that many species growing on the ground in 

 the woods are always to be looked for in the neighborhood of cer- 

 tain tree species. Perhaps collectors exaggerate this impression 

 but in any case the subject needs clearing up. With regard to 

 species found regularly occurring on wood, there is no doubt that 

 they follow more or less the distribution of their specific substrata. 

 In some cases, to be sure, a species may have a wide selection of 

 material on which it can grow, and hence its distribution is not 

 limited in such a maimer. The species which have a parasitic ten- 

 dency, like Pleurotus ulmwius, must have their distribution con- 

 trolled to a large extent by the presence of the foster plant, al- 

 though no Agaric which requires a living host at all times seems 

 to be known with certainty. 



COLLECTING AND PRESERVING AGARICS 



For the Tabic 



A basket, clean white tissue paper cut a foot square, a large pocket 

 knife, a knowledge of mushrooms, favorable weather and the right 

 place — these are the essentials. Of these the possession of accurate 

 information is most important, since ignorance may mean sickness 

 or death. If inexperienced and dependent on others for guidance. 



