Scytonema guyanense var. epiphyllum N.L.Gardner

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Determined by Francis Drouet

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Figure 12. Scytonema guyanense epiphyllum. Typical filaments showing a
variety of shapes of cells. X 250.

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17a. Scytonema guyanense epiphyllum var. nov. Plate 2, fig. 12.

Filaments prostrate, creeping, single or associated into small groups; main
filaments 15-20 p. diam., young ramuli of less width; sheath yellowish brown,
lamellose in the older parts, the lamellae parallel; trichomes 9-13 \± diam.; cells
variable in shape, in part cylindrical and quadrate, in part shorter and slightly
dolioform; heterocysts mostly the same shape as the contiguous cells and fre-
quently only a few cells from the apices.

Growing on the leaves of Renealmia sp., Las Marias, July 10, 1915, F. L.
Stevens, 1175. The type.

The outstanding distinguishing feature of this variety of S. guyanense is
its habitat and habit of growth. It does not form cusjiions of densely compact
layers of erect filaments as is usually the case. On the contrary, it creeps close to
the substratum and apparently its branches- are prostrate and parallel with the
same. There is more variation in the cell and in the sheath characters than is
ordinarily represented in S. guyanense.

FRANCIS DROUET "f Xt\ -j y

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