a 



' 



298 CONIFERALES INCERTAE SEDIS 



Ullmannia Bronni Goeppert. 



The fragments of foliage-shoots on which Goeppert 1 founded this 

 species were described by some earlier authors as the Frankenberg 

 ears of corn and by Schlotheim as Poacites phalaroides. Bronn, who 

 first identified the fossils as Coniferous, named them Cupressites 

 Ullmanni. We know nothing of the structure of the reproductive 

 shoots, and the cones referred by Goeppert to this species have 

 since been assigned to the genus Strobilites. In habit and leaf-form 

 Ullmannia Bronni is indistinguishable from certain Triassic and Ju- 

 rassic foliage-shoots referred by most authors to Pagiophyllum. The 

 leaves are imbricate (fig. 750, D, E) ; the lamina is oval or broadly 

 linear, elliptical, and characterised by longitudinal striations. Some 

 imperfectly preserved leaves examined by Solms-Laubach showed 

 clear indications of the presence of a midrib with lateral groups oi 

 transfusion-tracheids, as in U. selaginoides and U. frumentaria. 



Ullmannia selaginoides (Brongniart). 



This and the following species, U. frumentaria, are founded on 

 vegetative shoots from the Permian of Ilmenau (Thuringia) and 

 both were described by Brongniart as examples of Fucoides 2 . The 

 leaves of U. selaginoides are longer than those of U. Bronni, linear 

 and almost uniform in breadth, elliptical in section. There is a 

 single vascular bundle accompanied by wings of reticulate trans- 

 fusion-tracheids (cf. fig. 750, C) associated with parenchyma 3 . 

 As in the leaves of recent Conifers the transfusion-tissue persists 

 in the apical region of the lamina. There are 1 2 rows of hypo- 

 dermal fibres below the epidermis with sunken stomata and the 

 mesophyll consists largely of palisade-cells (cf. fig. 750, B). Th< 

 stele of the shoot has a large pith with nests of dark cells enclose 

 by a cylinder of secondary xylem consisting of tracheids having a 

 single row of separate circular pits on the radial wall and uniseriate 

 medullary rays 1 6 cells deep. 



Ullmannia frumentaria (Schlotheim). 



This species, originally named Carpolithes frumentarius*, is the 

 commonest fossil in the Ilmenau mines. The leaves are lanceolate, 



1 Goeppert (50) p, 185, PL xx. For synonymy, see Solms-Laubach (84); 

 Geinitz (80). 2 Brongniart (28) A. PI. ix. 



3 Solms-Laubach (84) PL in. figs. 1, 4, 6, 15. 



4 Schlotheim (20) A. PL xxvu. fig. 1 For figures, see Geinitz (80); etc. 



