176 ' CLAVIS AGAEICINORTJM. 



and distributed from Cadeby, Leicestershire, by the Eev. Andrew 

 Bloxam, under the name diverslfollus, Lindl., to which it is nearly 

 allied. Mr. Bloxam showed it to me growing a few years back in 

 Gallows Lane, near Twycross. I have never seen it, except from his 

 immediate neighbourhood. It differs from diversifolius only, T believe, 

 in being an intenser, more open, and compound-panicled form. The 

 stem- and rachis-prickles are denser but smaller, and rather less variable 

 in length. The sepals are more markedly attenuate and clasp the 

 fruit in a more csesian way than diversifoUus. I believe this is a form 

 of much less varietal value than the other four members of my dumeto- 

 rum group. 



Concluding Note. 

 One word of caution to conclude with. The botanist must not ex- 

 pect every dumetose form which he gathers to fit in exactly with one 

 of our five described varieties. Next, dangerous as all conclusions, 

 drawn from dried specimens only, always are in ru biology, such are 

 trebly hazardous in the dumetorum group. Last, never gather a weak 

 or ill-grown example, as such are peculiarly deceptive ; and get, if pos- 

 sible, fruited, not merely flowering, panicles. 



Explanation of Plates CVI. and CVII. 



Plate CVI. — Subus dumetorum, W. and N. ; var. j8. tuherculatus, Bab. 

 From specimens collected by J. Gr. Baker at Sheen Common, Surrey. 



Plate CVII. — Ruhus dumetorum, W. and N. ; var. 5. diversifoUus, Lindl. 

 From specimens collected by Hon. J. L. Warren at Black Pit, Tabley, Cheshire. 



CLAVIS AGARICINORUM : 



an analytical key to the british agaricini, with 



characters of the genera and subgenera, 



By Worthington G. Smith, F.L.S. 



{Read before the Woolhope Club, Hereford, February 22nd, 1870.) 

 {Continued from page 145.) 



3. Characters of the Genera and Subgenera of the 

 Agaricini. 



Order Agaricini. — Hymenium inferior, spread over easily-divisible 

 gills or plates radiating from a centre or stem, which may be either 

 simple or branched. 



Genus I. Agaricus, Linn. Syst. Nat. (1735).— Spores of various 



