File:Cyathea cranhamii fertile structures.jpg

Details of the preserved fertile structures of Cyathea cranhamii.

Original caption: Figs. 1–6. Cyathea cranhamii sp. nov. 1. Cross section of fertile pinnule and indusiate sorus showing anatomical features. Note bundle sheath extensions of mid- and lateral veins (V) and multicellular indusial wall (I). Paratype P13021Hbot #107c x85. Scale = 200 µm. 2. Longitudinal section of sorus attached superficially beneath lateral vein (V) of pinnule. Vascularized receptacle at R. Paratype P13021Hbot #114c x46. Scale = 250 µm. 3. Section of specimen in Figs. 1 and 2 at a level where two sori are attached. Paratype P13021Hbot #68c x46. Scale = 250 µm. Figs. 4–6 . Cross sections of one sorus showing features near base (Fig. 4 ), at mid-level (Fig. 5 ), and at apex (Fig. 6 ). Note distal slit that extends basally to mid-region (at arrows). Holotype P13021Hbot #91b, 56b, 45b, respectively, all x52. Scale = 250 µm

Source: Smith, Selena Y., Gar W. Rothwell & Ruth A. Stockey 2003. Cyathea cranhamii sp. nov. (Cyatheaceae), anatomically preserved tree fern sori from the Lower Cretaceous of Vancouver Island, British Columbia. American Journal of Botany 90: 755-760.

Copyright: © 2003 Botanical Society of America, Inc.

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