The embryo sac of Cyrtanthus seems to follow the regular Lilium type. The endosperm is very extensive. 2. Stomata are more numerous on the inner than on the outer surface of the carpel. 3. There are three separate bundles at the midrib of each carpel and two at the fusion of the carpels. This arrangement is related to the various parts of the flower. 4. The youngest observed stages of the embryo have the stem tip enveloped by a sheath with four lobes at its top. 5. In an older embryo the sheath is differentiated into a longer and a shorter side, the appearance and vascular anatomy of which give the distinct impression of two cotyledons. 6. Any pressure or fusion is referred to the extraordinary amount of endosperm. 7. The investigation is considered a last proof of the theory of monocotyledony from dicotyledony.
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Margaret Elizabeth Farrell (1914) studied this question.