FOSSIL PLANTS OF BRITAIN. 455 



Tubicaulis, Cotta. 



Stem composed of larger and smaller tubiform fasciculi, and surrounded 

 by a brown sufficiently conspicuous tunic ; the larger tubes converging, 

 distant, inclosing vescicles, and surrounded by the smaller tubes, which are 

 arranged without any order ; the vescicles in a transverse section of the 

 stem presenting a regular form. 



Tubie. dubius, Cotta, 1 page 25, tab. 1, fig. 3, 4; Gopp. page 



456. Locality unknown. 

 1 primarius, Cotta, tab. 1, fig. 1, 2 ; Gopp. page 454. 



Endogenites solenites, Spreng. page 32. Red sandstone, 



Freyburg. 



ramosus, Cotta, tab. 3, fig. 1 — 3; Gopp. page 455. 



solenites, Cotta, tab. 2, fig. 1, 2, 3; Gopp. page 454. 



(Endogenites, Spreng.) Red sandstone, Freyburg. 



Psaronius, Cotta. 



Fasciculi parallel, seated on the stem, and surrounded by brown conspi- 

 cuous tunics, which are either cylindrical or tubular, or wider, resembling 

 a copula ; these last are filled by a thick cellular tissue, the former con- 

 taining small angular columns. 



Psar. Asterolithus, Cotta, page 29, tab. 4, fig. 1 — 4. Endo- 

 genites Asterolithus, Spreng. page 33, fig. 1 ; Starry stone, 

 Parkinson, i. tab. 8, fig. 3 — 6; Gopp. page 456. Neue 

 Paka, Bohemia. 



Helmintholithus, Cotta, page 31, tab. 5, fig. 1, tab. 6, 



fig. 1 — 3, tab. 7, fig. 1, 2; Endogenites Psarolithus, Spreng. 

 page 37, fig. 5; Parkinson, i. page 410, tab. 8, fig. 1, 2, 5, 

 7 ; Gopp. page 457. Red sandstone, Chemnitz, in Sax- 

 ony. Neue Paka, Bohemia. 



Ad. Brongniart considers the affinity of Psaronius to arborescent ferns 

 as very doubtful, and that its internal structure is more analogous to the 

 base of the stem of some gigantic and arborescent Lycopodium, the two 

 species above named being only different portions of it ; Psar. Hehnintho- 

 lithus representing the fibro-vascular axis of the stem of the Lycopocliacea;, 

 the Psar. Asterolithus corresponding to the exterior cellular tissue of the 

 same stems. Hist, des Veget. Foss. ii. pp. bl — 67. 



Porosus, Cotta. 



Stem covered with tube-formed fascicles of vessels, which are conspicu- 

 ous in the cuticle, the inner part filled with a porous mass destitute of 

 structure. 



Por. communis, Cotta, page 39, tab. 8, fig. 1 — 3; Gopp. page 



458. Dresden and Chemnitz. 

 marginatus, Cotta, page 41, tab. 8, fig. 4, 5; Gopp. page 



458. Locality unknown. 



1 Die dcndrolithen in Beziehung auf ihren inneren Bau von C. B. Cot- 

 ta, Dresden, 1832. 



