two sections Hymenochaete with colored hairs, which he termed setae, and Peni- 

 ophora with hyaline hairs, which he termed metuloids. Bresadola (or perhaps it 

 was Karsten) found that the original species of Kneiffia had hyaline hairs, and at 

 one time would have changed all Peniophoras to Kneiffia on the strength of 

 "priority;" but he has since quite happily abandoned it, also on the grounds of 

 "priority," I believe. His most recent discovery is that the pileate species with 

 colorless hairs (which he called Lloydella) is a different genus from the resupinate 

 species with colorless hairs. 



The hair feature of Thelephoraceae has in recent years been exploited with 

 great detail by von Hohnel, who bases a "new genus" (and adds "von Hohnel" to 

 each species as an incidental and necessary feature ot such work) on each size, shape, 

 exudation, coloration, and position of the hairs he finds on the hymenium. This is 

 very prettv in theory but quite embarrassing in practice, for the hairs grade into 

 each other in all degrees, and when the system is worked out there will be more 

 doubtful species (as to "genus") than before. Another very objectionable feature 

 to me is that it practically suppresses the old-established genus Stereum, for I find 

 when I come to look into the details that the greater part of the species of foreign 

 Stereums have hairs of some sort, and most of them become Lloydellas. I have 

 indicated them for the benefit of the future "scientist" who may desire to juggle 

 them, and add his name to them. I am glad to note that in our most recent paper 

 our latest investigator (Miss Wakefield, Trans. British Myc. Society, 1912) recog- 

 nizes the unsatisfactory nature of the hairs as a basis of classification and the diffi- 

 culty in several instances of deciding whether they are "outgrowths" ot a Corticium 

 or "cystidia" of a Peniophora. While the consideration of these problems may be 

 necessary in treating of the resupinate species, owing to their excessive number, 

 there is no reason, except the desire for a "change," why it should complicate the 

 genus Stereum. It is neither so large nor so difficult that it i? necessary or advisable 

 in my opinion to break it up in such an artificial manner. We have therefore taken 

 the genus Stereum in its usual meaning, believing that little improvement is made 

 in tinkering with it and changing it on either "stipe" or "hair" features. 



DIVISIONS OF THE GENUS STEREUM. 



We would divide the genus, as Persoon did, into three general classes, viz.: 

 stipitate, sessile, and resupinate or subresupinate. 



Stipitate species have a stipe either mesopodial or pleuropodial, or are reduced 

 to a stipe-like base. Stereums with stems have been discovered to he a "new genus," 

 but we feel they are best classed as a part of the old genus Stereum. We see no more 

 reason why a stem in a Stereum should make a genus than a stem in any other class 

 of fungi. The stipitate species we divide into eleven sections, as follows: 



No. 1. Cladoderris. This section has a mesopodial stem, uneven, pileate 

 hymenium (usually), and a pad of matted hairs on the pileus. It is the connecting 

 link between the genus Cladoderris and Stereum, and could be classed with either. 



No. 2. Stipitate, with a mesopodial stem. Smooth, white or pale. 



No. 3. Stipitate, mesopodial or pleuropodial (often both). Smooth, yellow or 

 puiplish red. 



No. 4. Stipitate, mesopodial or pleuropodial. Smooth. Reddish, bay-brown 

 (at least when dry). 



No. 5. Stipitate. Pileu's hirsute, often zoned. Hymenium even. 



No. 6. Merismatoid in manner of growth. 



No. 7. Clavarioid in general form. Cut into narrow segments. This differs 

 from Clavaria in having the hymenium only on the lower side of the segments. 



No. 8. Erect, dendroid, with the form of a Clavaria. Hymenium amphigen- 

 ous. 



No. 9. Petaloid with lateral stem, glabrous. 

 No. 10. Petaloid, with lateral stem, hirsute. 



No. 11. Section hymenochaete (stipitate). Having colored, rigid setse on the 

 hymenium. 



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