VIRTUAL GALLERY

Medullosa
1:1		Medullosa noei stem from the Pennsylvanian in transverse section showing numerous vascular bundles.
1:2		Myeloxyleon petiole from the Carboniferous of Iowa in transverse section.
1:3		Alethopteris compression/impression, Penssylvanian.
1:4		Alethopteris sullivanti impression/compression from Mazon Creek, Illinois (Pennsylvanian).
1:5		Neuropteris compressed leaflet (Permian).
1:6		Cast of Trigonocarpus seed from the Carboniferous.
1:7		Pachytesta, permineralized seed in oblique-transverse cross section.
1:8		Whittleseya microphylla, pollen organ of Medullosa. From the Lower Pennsylvanian of Arkansas.
1:9		Longitudinal section of permineralized Dolerotheca formosa pollen organ.
Cycads
1:10		Extant cycads, Cycas revoluta, growing outside the Hertz music building on the U.C. Berkeley Campus.
1:11		Nilssonia foliage compression from the Cretaceous of British Columbia.
1:12		Example of Taeniopteris-type foliage: Taeniopteris lentriculiformae from the Triassic of Australia.
1:13		Cycad ovule in longitudinal section. Note the massive pollen chamber, layering of integument, and the cellular gametophyte. Compare with the conifer ovule.
1:14		Cycad male strobilus in longitudinal section, showing scale-like microsporophylls bearing microsporangia on their abaxial surface. Compare to Pinusstaminate cone.