Sperm-nucleus, 245.
Spermocarp, 58.
Spermogonia, 89, 141, 146, 147, 149.
Spermothamnion, 84.
Sphacelaria, 70.
Sphacelariaceæ, 70.
Sphacelia, 125, 126.
Sphacelotheca, 110.
Sphæralcea, 430.
Sphærella, 48, 130.
Sphærellaceæ, 130.
Sphæriales, 129.
Sphærobolaceæ, 173.
Sphærobolus, 173.
Sphærocarpus, 191, 192.
Sphærococcaceæ, 83.
Sphærophorus, 142.
Sphæroplea, 13, 14, 58.
Sphæropleaceæ, 47, 58.
Sphærotheca, 120, 121.
Sphærozosma, 44.
Sphagneæ, 193.
Sphagnum, 186, 188, 192, 194, 195, 197.
Sphenogyne, 566.
Sphenophyllaceæ, 233.
Sphinctrina, 140.
Spigelia, 546.
Spikelet, 285, 287, 289.
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