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Vascular Anatomy of Cotton Carpels as Revealed by Digestion in Ruminal Fluid¹

The vascular anatomy of cotton (Gossypium hirsutum L.) carpels was revealed when cracked fresh bolls were incubated in bovine ruminal fluid, rinsed, dried, and examined without further preparation. Radially-oriented club-shaped terminal vascular elements surmounted a roughly cuboidal middle meshwork which arose from a tangentiallyoriented inner layer. The above anatomy may be associated with the reflexing of the carpels at boll opening by causing greater shrinkage during dehydration in the outer layer than in the middle and inner ones.

Key Words: Gossypium hirsutum L.

² Plant pathologist and microbiologist, respectively, ARS-USDA, Received 3 January 1977. Beltsville, MD 20705.

Received for publication January 3, 1977.