SPORES HYALINE. 



This is not a rare plant in France, England, and Central Europe, 

 growing usually on oak. It is said to be found also on beech and elm. 

 It is quite rare in more northern localities, and in Sweden Fries in his 

 latest work records it as "v. s.," though in one of his earlier works he 

 mentions seeing it. Romell has only lately found it around Stock- 

 holm. In the United States we have about the same history. Schwein- 

 itz misrecords it, and the older generation hardly knew it. It is rare 

 in our Northern and Eastern States, and only two years ago Professor 

 Peck found it for the first time. Long tells us that it is frequent in 

 the Southwest, also that it is a root rot and usually develops near the 

 base of the tree. It has been noted from early days for exuding drops 

 of water, as shown in our figure, Mycological Notes, p. 491. 



The spores of Polyporus dryadeus as found in specimens are 

 usually hyaline or with the faintest trace of color, but we have a 

 recent collection from Hawaii with spores pale, but distinctly colored. 

 We believe now that the spores are hyaline when young, pale colored 

 when mature, and hence the plant should be entered in the next 

 General Division in Section 100 B. (cfr. Note 232, Letter 56.) 



ILLUSTRATIONS. Bulliard, t. 458, very good. Hussey, t. 21, not so good. Fries miscites 

 it as t. 26, and both Murrill and Saccardo demonstrate the thoroughness of their "investigations" by 

 copying the mistake. Hartig's figure is a misdetermination for Polyporus corruscans, and the other 

 plant disease men, Comes, Istvanffi, and Tubeuf, have probably copied it. We have not looked up 

 their figures. 



SPECIMENS. Mostly from Europe, a few only from United States. Recently received also 

 from Dr. J. B. Cleland, Australia, and C. N. Forbes, Hawaii. 



Compare pseudo-igniarius. 



The following plants have been considered in Section 35, p. 160 of our Stipitate Polyporoids, 

 on account of their evidently close relationship to Polyporus circinatus. 



POLYPORUS TRIQUETER. Pileus half dimidiate, (3-4 cm. 

 thick), reduced at the base. Surface and context yellow ochre. 

 Pores darker. Surface tomentose, soft. Context softer and spongy 

 near the demarkation. Pores small, round. Setae large, hooked. 

 Spores 3x5, hyaline (?), probably immature. 



We take this in the supposed sense of Fries, teste Romell (Mr. 

 Romell found it rare on Pinus sylvestris). It is a rare form in Europe, 

 and has the same color and microscopic features as Polyporus cir- 

 cinnatus, of which itlis probably only a form. I do not know it from 

 the United States. I think it is not triqueter of Persoon (cfr. cuti- 

 cularis). 



SPECIMENS. prance, Dr. Pierrhugues; Austria, Dr. F. v. Hohnel; Sweden, L. Romell. 



POLYPORUS LEPORINUS Exactly the same as the pre- 

 ceding plant in every feature excepting that it is thin, (less than a 

 cm. thick), and there is a stronger contrast between the firm lower and 

 soft upper flesh. On this account it was called Polyporus dualis by 

 Peck. It is a very rare plant both in Europe and the United States. 



SPECIMENS. Sweden, L. Romell, fine specimens; C. G. L., effete; Bohemia, Dr. Fr. Bubak; 

 Canada, C. G. L.; Michigan, Dr. C. H. Kauffman. 



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