266 



Mycologia 



all around the spot. I have not microscopically established the 

 determination of the host but I think it is still possible to do it. 

 My first thought was that it possibly might be the true Polyporus 

 resinosus of Fries, a species which I had not seen before or had 

 not been able to distinguish from Polyporus benzoinus, with 

 which there was some resemblance, but my plant was thin and 

 lobate or incised (although not in the same degree as the speci- 

 men from oak) and the spores were globose, 4-6/x, diam. (while 

 the spores of P. benzoinus are sausage-shaped, 4-9 X I -5 _ 3/*)« 

 The blackening also agreed with the oak form. 



Polyporus pinicola is another example, as Polyporus margi- 

 natus is now universally, I think, considered identical with it. 

 But here the needle trees seem to be the preferred hosts and the 

 occurrence on broad-leaved trees more rare. On Cerasus I saw 

 this fungus but once, on Alnus perhaps twice and on Betula 

 several times.* Polyporus annosus, common on Pinus abies L., 

 grows sometimes on stumps of deciduous trees. I think I saw 

 it but once or twice on such a host. 



Among the Hydnaceae, Radulum orbiculare is a decided broad- 

 leaved tree inhabitant {Betula, Sorbus, Salix, etc.). Neverthe- 

 less, G. V. Schotte has collected it also on Abies pectinata. 



Of the Thelephoreae, I will mention Stereum ferrugineum (or5\ 

 rubiginosum, which is now considered a synonym). This grows 

 generally on oak here in Sweden but is found sometimes on 

 Pinus. Stereum tabacinum is also a lover of deciduous hosts, 

 notably Corylus and Salix, but I collected it recently on Juni- 

 perus, and it seemed to thrive on this host, for it had covered 

 the whole trunk. Corticium evolvens is found mostly on broad- 

 leaved trees, but occurs also on needle trees. The same can be 

 said of Corticium cinereum, C. confluens, C. velutinum, and 

 others. 



Of the gill-bearing Hymenomycetes I will mention only two. 

 I think that others as well as myself consider Pholiota squarrosa 

 a deciduous tree fungus. I have, however, seen it also in con- 



* Whether Polyporus rotundatus (see Fries, Hymenomycetes, page 554, sub 

 P. helveolus) is the same as P. pinicola, as I have reason to suspect, will 

 perhaps never be determined, as no type specimen exists so far as I know. 

 According to a note, Dr. Lindblad found his fungus " in codice vetustiori 

 Betula," while Fries refers it " ad truncos Pini." 



