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. 2004 Jul;94(1):167–178. doi: 10.1093/aob/mch124

Table 3.

Three subtypes of Type II seeds as indicated by differences observed in the diameter of the perforations of the inner periclinal wall

1. Inner periclinal walls of epidermal seed coat cells with perforations smaller in diameter than the thickness of the walls that separate them; a small central mammilla sometimes present on cells Subtype IIA
1′. Inner periclinal walls of epidermal seed coat cells with perforations similar in diameter or superior to the thickness of the walls that separate them; small central mammilla absent on cells 2
2. Inner periclinal walls of epidermal seed coat cells with perforations similar in diameter to the thickness of the walls that separate them Subtype IIB
2′. Inner periclinal walls of epidermal seed coat cells with perforations larger in diameter than the thickness of the walls that separate them Subtype IIC