Herrin Fossil Flora
Sphenopsids - Relatives of the Horsetails
Leaf Whorls
Annularia inflata
Annularia inflata in a concretion. - K.Robitschek
Annularia inflata, (Page 3, Fig. 3. Herrin Roof Shale Flora field guides, ESCONI/Wittry). - G.Monreal
Annularia inflata with Lepidostrobophyllum acuminatum. - V.Anderson
A.Young
S.Dibblee
D.Quasney
Annularia inflata. - B. Riegler (photo by B.Riegler)
Annularia inflata. - C.Puritz (photo by C.Puritz)
Annularia inflata - L.Bertsch
Annularia annulariaefolius
Annularia annulariaefolius, (Page 3, Fig. 2. Herrin Roof Shale Flora field guides, ESCONI/Wittry). - A.Young
Annularia annulariaefolius, details above and below. - A.Young
A.Young
Annularia sphenophylloides
Annularia sphenophylloides, (Page 3, Fig. 4. Herrin Roof Shale Flora field guides, ESCONI/Wittry). - C.Puritz
Annularia sphenophylloides with Macroneuropteris scheuchzerii, Asolanus camptotaenia, and Synchysidendron andrewsii. - B. Riegler.
Annularia sphenophylloides. - D.Drizner
Annularia sphenophylloides with Lepidostrobophyllum acuminatum and Cyperites bicariinatus. - E.Magnus-Gentry
Annularia sphenophylloides. - C.Puritz (photo by C.Puritz)
Annularia radiata
Annularia radiata. - C.Puritz (photo by C.Puritz)
Asterophyllites equisetiformis
Asterophyllites equisetiformis, (Page 3, Fig. 5. Herrin Roof Shale Flora field guides, ESCONI/Wittry). - A.Jansen
A.Young
Sphenophyllum emarginatum
A.Young
Sphenophyllum emarginatum, (Page 3, Fig. 1. Herrin Roof Shale Flora field guides, ESCONI/Wittry). - B.Riegler
A.Young
A.Young
A.Young
Sphenophyllum emarginatum in uncooked shale - B.Gentry
Sphenophyllum emarginatum in uncooked shale - E.Magnus-Gentry (positive and negative halves)