. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . PLATE IV. Cladophoia lactuca, var. rigida. Ulva GRASS-GREEN SEAWEEDS 55 consists of a single layer of cells it is Monostromn (onelayer ); when it consists of a double layer it is Vim; when thelayers separate, the thallus becomes hollow, and it is then En-tcronioi-pJia. These plants are mostly a brilliant grass-greenin color, are silky in texture, and are attached by a small disk torocks and stones. They abound everywhere, aud a
. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . PLATE IV. Cladophoia lactuca, var. rigida. Ulva GRASS-GREEN SEAWEEDS 55 consists of a single layer of cells it is Monostromn (onelayer ); when it consists of a double layer it is Vim; when thelayers separate, the thallus becomes hollow, and it is then En-tcronioi-pJia. These plants are mostly a brilliant grass-greenin color, are silky in texture, and are attached by a small disk torocks and stones. They abound everywhere, aud are commonlyknown as green hirer. GENUS Viva Frond a thin, silky, flat membrane, sometimes leaf-like, again anextended surface of no definite shape. These are the largestgreen algre. They are common everywhere. I. lactuca, the sea-lettuce. Frond a flat membrane of various shapes,sometimes orbictdar, again deeply incised, often ribbon-like; marginalways much waved or ruffled. In the variety riyida the frond is ovalin outline, not very large, and quite firm or rigid. The species is foundon rocks exposed to the actio
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmarinea, bookyear1901
