MICHIGAN ACADEMY OF SCIENCE. 57 



The question arises whether the Hormodendrum is parasitic or not upon the Araucaria. 

 If it is parasitic, it is very weakly so, but if it is not a parasite, it is difficult to understand 

 how it can grow upon the surface of a plant like the Araucaria. If it can live merely on the 

 dust that collects on the surface of such a plant, together with any dead material which 

 the host plant may shed on the surface, and do this in the comparatively dry atmosphere 

 of an ordinary living room in a dwelling house, then it has some remarkable physiological 

 characteristics. This possibility will be taken into consideration in the experiments with 

 the fungus. 



The Araucaria plant first mentioned had been kept in the green house for a portion of 

 the year, and the owner of the Araucaria thought that it bore the fungus when returned to 

 her home. The moist atmosphere of a green house of course might furnish conditions fa- 

 vorable to the growth of the fungus, and it may not have spread any in the dryer atmo- 

 sphere of the dwelling. That it was alive, however, in the latter place was shown by the 

 growth on the detached leaves in a moist chamber, so that either the mycelium or the 

 spores or both must be resistant to the dryness of an ordinary living room. One writer 

 has suggested that a fungus growing in such a way might not be actively parasitic, and yet 

 be injurious to the plant upon which it grew by stopping up the stomata, and so inter- 

 fering with the functions of the host. Experiments are in progress which it is hoped will 

 throw some light on the questions naturally suggested by the facts reported above. 



University of Michigan. 



MICHIGAN FUNGI. 

 Jas. B. Pollock and C. H. Kauffman. 



In the fourth report of the Michigan Academy of Science Mr. B. O. Longyear, formerly 

 of the Michigan Agricultural College, began for the Academy the publication of a list of 

 Michigan fungi. This list includes nearly all the species given in a former list by the 

 same author and published in the report of the secretary to the State Board of Agricul- 

 ture for 1898. Those species not so included were apparently all doubtful ones. 



Since Mr. Longyear has left the state and undoubtedly will not continue the work begun, 

 it seems desirable that some one else take it up and publish in the reports of the Academy 

 from time to time lists of Michigan fungi, so that a knowledge of the fungus flora of the 

 state may be available to all interested in the subject. 



The present list has been prepared with this in mind, and the authors have used as a 

 starting point the fungi in the herbarium of the University of Michigan. It is not in- 

 tended to give a catalogue of the fungi in the University herbarium, but to present only 

 those species of Michigan fungi not previously published by Mr. Longyear. The list as 

 here given includes only the Ascomycetes, the imperfect fungi, and the Hymenomycetes. 

 The authors have divided the work so that Mr. Kauffman prepared the list of Ascomy- 

 cetes, and the families Clavariacea; and Agaricacea?, while Dr. Pollock made up the list 

 of imperfect- fungi, and the families Polyporacese, Hydnacea^ and Thelephoracese. 



Most of the fungi in the local collection in the University herbarium were collected by 

 Prof. V. M. Spalding and Mr. L. N. Johnson, the latter especially collecting a large number 

 of specimens. Other collectors who have added substantially to the local collection are 

 Mr. G. H. Hicks, Mr. A. J. Pieters and Miss H. L. Merrow. Some other names also appear. 



Many of the specimens have been identified by Dr. Peck of New York, or by ilr. Ellis 

 of New Jersey, well known mycologists. It was deemed advisable to indicate this fact 

 since the identification is thereby vouched for. Where no outside authority for the iden- 

 tification was indicated on the herbarium sheet, the authors have supposed that the col- 

 lector was responsible for the identification. Ann Arljor is the locality except where 

 stated otherwise. Fortunately the local collectors have been workers of more than aver- 

 age accuracy, and this was especially true of Mr. L. N. Johnson, whose collections were 

 mostly made in 1893 and 1894. Mr. Johnson went over the whole herbarium, making 

 many corrections in the older names, and in every way his work shows extreme care and 

 accuracy. Nevertheless a few specimens were found which were obviously wrongly named, 

 and some others which were doulatful. Those have not been included in the present list, 

 which the authors hope will be reasonably reliable. 



It is intended to continue the publication of species of other groups of fungi in the Uni- 

 versity herbarium, as well as to add to the collection of species known to occur in Michi- 

 gan. Knowledge along this line is exceedingly meager, and the authors will be pleased 

 to receive the co-operation of mycologists and collectors in all parts of the State. Mate- 



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