X] ANNULARIA. 



about the middle, 1 — 5 cm. in length and 1 — 3 mm. broad, hairy 

 on the upper surface^; each leaf is traversed by a single vein. 



Fig. 88. Branch of Annularia steJlata (Schloth.). i nat. size. 



From a specimen in the Collection of Mr R. Kidston. Upper Coal- 

 Measures, Radstock. 



Each whorl contains 16 — 32 segments, which are connected 

 basally into a collar or narrow sheath ; the lateral segments are 

 usually longer than the upper and lower. The branches are 

 about 6 — 20 mm. broad, with finely ribbed intemodes 3 — 7 cm. 

 long, bearing verticils of leaves ; the ultimate branches arise in 

 paii'S in the axils of the lateral segments of the verticils. 



The strobili are of the Galamostachys'^ type and are borne 

 on the main branches or possibly on the stem ; they have a long 

 and narrow form and are attached in verticils at the nodes. 

 Each strobilus consists of a central axis bearing alternate whorls 

 of linear lanceolate sterile bracts and sporangiophores, about 

 half as numerous as the sterile bracts; each sporangiophore 

 bears four ovoid sporangia. 



The anatomical structure of a specimen referred to An- 

 mdama stellata has been described by Renault*. The cortex 



1 Potoni6 (98), p. 166. » Vide pp. 861 et $eq. 



« Renault (90), p. 60; (93), PI. xxvm. 



22—2 



