138 Mr. R. Kidston 07i Ulodendron. 



that the sketch given by Renault on pi. xi. fig. 1, which 

 shows three Ulodendroid scars placed on a stem bearing 

 Lepidoplihios leaf-scars, represented in inverse position, does 

 not agree with any specimen which has come under my 

 notice either in nature or in the literature of fossil botany. 



Most authors have united Bothrodendron, Lindley and 

 Button, with Ulodendron, and in this view I quite concur. 

 Some of the figures which accompany these notes show on 

 one or more parts of their surface a condition similar to that 

 upon which Lindley and Hutlon founded their genus Bothro- 

 dendron'^. There are, however, some recent writers who still 

 regard Bothrodendron as a true genus ; to this view I must 

 therefore shortly refer. 



1880. Zeiller. Veg^taux fossiles du terrain houiller de la 

 France, p. 116. — Bothrodendron is thus defined by Zeiller: 

 " Trunks marked with extremely small foliar cicatrices, 

 rhoraboidal in form, rounded at the angles, placed in quin- 

 cuncial order, and each surmounted by a small cicatricule, 

 corresponding probably to the insertion of a scale. Foliar 

 cicatrices provided with three cicatricules, the central cica- 

 tricule placed slightly above the one on each side of it. The 

 large trunks present, in additioti, large circular depressions, 

 more or less deeply concave and placed in two diametrically 

 opposite vertical rows." 



In Bothrodendron Zeiller mentions two species — one B. 

 punctatum^ L. & H., and the other B. {Rhytidodendron) 

 minuti folium^ Boulay, sp. This last-mentioned plant was 

 described by Boulay as a type of a new genus which he calls 

 Bliytid,odendron\ . " This genus," Boulay says, " is charac- 

 terized in the group of the arborescent Lepidodendvege by the 

 very distant, transversely elliptical, and very small leaf-scars, 

 which form a small area with three cicatricules surrounded by 

 an elevated border. These three cicatricules at once separate 

 this genus from Stigmaria ; the bark is delicate and finely 

 wrinkled and chagrined transversely ; after the decay of the 

 bark we find on the trunk two elongated prominences corre- 

 sponding to the cicatricules." 



In his ' Veget. foss. du terr. houil.,' Zeiller does not give a 

 figure of the specimen he places under Bothrodendron puncta- 

 tum, L. & H. ; but in his paper " Observations sur quelques 

 cuticules"J, under the name of B. pimctatum, on pi. ix. fig. 1, 



* See PI. VI. fig. 10, d; PI. VII. fig. 13, b. 



t ' Le terrain houiller du nord de la France et ses v^g^taux fossiles,' 

 p. 39 (1876). Lille. 



X Ann. des Sci. Nat. 6"^ s^r. Bot. vol. xiii. p. 218, pi. ix. fig. 1. 



