LYCOPODIALES— SUBSIGILLAEI.E— ASOLANUS. 235 



interesting plate published by Weiss. Some of our leaf scars show evi- 

 dence of ornamentation near the lower border between the lower ends of the 

 lateral traces, but it is too obscure for satisfactory description or delineation. 



The homology of these extensively developed traces with the lateral 

 cicatricules of the leaf scar in Lejndodendron or LepidopMoios, which are 

 regarded by Potoui^ as the cross sections of transpiration strands, leads us 

 to conclude that, if the hypothesis is not incorrect, the transpiration tissue 

 of Sigillaria camptotcenia was extensively developed, occupying a consider- 

 able portion of the interior of the leaf. 



Another interesting feature in the species before us is the presence of 

 interfoliate scars similar to those of other species of Sigillaria, especially the 

 Tessellata and Favidaria groups. The specimen (Fig. 3) from which the 

 details of the bolster and leaf scar described above are taken is a portion 

 of a slender stem or branch 46 cm. long and about 8 cm. wide, flattened 

 and lenticular infection. Scattered somewhat irregularly on the lower 11 

 cm. of this fragment are seen a number of rounded or oval pits, which, 

 when the epidermis is preserved, are found to be bordered by a smooth, 

 irregularly rounded zone containing a rather large central trace. These 

 scars are quite indejDendent of the leaf scars, which are complete and regu- 

 larly disposed in the phyllotaxy, though perhaps slightly dwarfed. It is 

 possible that they represent adventitious roots. But it seems more probable 

 that they are the homologues of the interfoliate scars supposed to represent 

 the cicatrices of the fallen strobili in other species of Sigillaria. 



As yet neither the cones nor even the mode of branching of Sigillaria 

 camptotcenia is definitely known. The cone described by Lesquereux^ as 

 Sigillariostrohus Laurencianus and referred by him tp the species in hand is 

 not in actual union with the cortex contiguous to it in the fossil state. 

 While appearing to represent a true Sigillariostrohus, its specific reference 

 appears to be based solely on the circumstance of commingled fragments in 

 the material from Kansas.^ 



To Sigillaria camptbtmiia probably belongs the Lepidodendron cruciatum 

 described in 1870^ from a single decorticated specimen with coarse, oblique 



1 Coal Flora, vol. iii, pp. 793, 794. 



-The specimens now iu the Lacoe collection in the United States National Museum are, as Pro- 

 fessor Lesquereux pointed out, loc. cit., p. 794, clearly congeneric if not specifically identical with the 

 cones earlier described by him as TrochophijU icm clavatinn, Coal Flora, p. 65, pi. iii, fig. 21. 



^ Rept. Geol. Surv. Illinois, vol. iv, p. 432, pi. xxv, fig. 2. 



