234. 



Mycologia 



portant distinctions which are of great use in comparing the 

 floras of different countries and habitats and in understanding 

 the variability of the groups. A proper arrangement should 

 recognize the fact that plants exist in varying groups, each con- 

 taining a multitude of forms due to many different causes and 

 that the groups are separated by gaps which have arisen in various 

 ways during the history of development. 



2. Hypholoma delineatum Pk. There appears to be no doubt 

 that Beardslee's specimens, one of which is shown in pi. 12, B, are 

 Hypholoma delineatum Pk. They are true species of Hypholoma 

 with dark purple-black spores and fragments of the veil about the 

 margin of the pileus. They confirm my opinion in note 2 on p. 

 413 of the article quoted above that the plant illustrated in Plate 

 XXI is not a Hypholoma but probably belongs to the Pholiota 

 erebia group and they also suggest that Peck's Hypholoma de- 

 lineatum is a form of the H. lacrimabundum group. The spores 

 are the same size and shape as those in the-H. lacrimabundum 

 group, Plate 12, C. They measure 4-5X7-8/*, in Beardslee's 

 specimens; Peck gives 4-6 X 8-10 /x. Peck placed the species 

 after H. rugocephalum because the pileus was rugose wrinkled. 

 Forms with rugose wrinkled pilei and similar in general appear- 

 ance occur in several groups. There is one in the Pholiota erebia 

 group illustrated in Trans. Wis. Acad., Vol. XVII, pi. LXXXIV, 

 E. It occurs both in this country and in Europe; one in the 

 Hypholoma velutinum group which Atkinson named H. rugo- 

 cephalum, Trans. Wis. Acad., Vol. XVIII, pi. XX; and there is 

 the typical form of the Cortinar'ius corrugatus group. The sur- 

 face of the pileus in the last species is exactly like that of H. 

 delineatum which Peck describes as " marked toward and on the 

 margin even when dry with irregular radiating lines or ridges." 

 But the color of the gills and the large tuberculate spores, 10- 

 11 X 12-14 easily distinguish Cortinarius corrugatus. 



Peck's description of Hypholoma delineatum is in the N. Y. 

 State Mus. Bull. 150, pp. 83-84. 



Geneseo. It.t.. 



