Ferns: British and Exotic, Vol. 6: Containing Onoclea, Fadyenia, Cyclopeltis, Didymochlæna, Aspidium, in Part (Classic Reprint) - Softcover

Excerpt from Ferns: British and Exotic, Vol. 6: Containing Onoclea, Fadyenia, Cyclopeltis, Didymochlæna, Aspidium, in Part

Sori circular, with one or two exceptions, where oblong. They are intramarginal, and have a special indusium, which is either orbicular, produced from the centre, (central,) or reniform or cucullate, produced from the interior side of the sporangiferous receptacle, (lateral,) or occasionally attached all round the receptacle, and including the sporangia, (calyciform.)

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