Fig. 27. LAMINAMA LONGICRURIS. 



Colour. A beautiful pale-green olive; tlie stem yellowisli brown. 

 Substance. Tliin; tender; very delicate. 



Character of Frond. A flat^ leafy expansion; ribless; growing from a stem. 

 Stem, very long; slender at each end; swollen and hollow above the 

 middle. Expansion, oval; with a wavy curled margin, as if frilled. 

 Eoot fibrous. 



MeasurGment. Stem from 8 to 12 feet long. Expansion_, from 6 to 8 feet 

 long; from two to three feet wide. 



Fructification. Minute seeds [spores) imbedded here and there in the surface 

 of the frond, thickening it, and forming cloudy patches. 



Habitat. Abundant on N. American shores from Greenland to Cape Cod. 

 Occasionally drifted to the coasts of Scotland and Ireland by oceanic 

 currents. 



But alas ! only the stems of this fine plant have ever reached us ; the delicate 

 membranous leaf being always torn away in the voyage. JSTevertheless, it is 

 well to look out carefully, for a happy accident may bring us a complete frond 

 some day. The stems are easily known from all others by their being hollow 

 {tabular). 



Fig. 28. LAMINARIA SACCHARINA. 



Colour. When young, greenish olive; brownish when old. 



Substance. When young, thin; more or less delicate; leathery when old. 



Character of Frond. A flat, leafy expansion; ribless; growing from a stem. 

 Stem, always short in proportion to expansion. Expansion, ribbon- 

 like, long, and narrow. Margins sometimes waviy and curled, some- 

 times smooth. Fronds sometimes puckered down the sides. Root 

 fibrous. 



Measurement. Stem, from a few inches to several feet long. Expansion, 

 from 2 to 12 feet long; from 4 to 16 inches wide. 



Fructification. Minute seeds [spores) imbedded here and there in the surface 

 of the frond, thickening it, and forming cloudy patches. 



Habitat. Our coasts generally. On rocks at low-water mark, and in deep 

 water; common. 



There may be a danger of confounding this plant, when young, with L. 

 Pliyllytis. Nevertheless, it is at all times thicker in substance, darker in colour, 

 and more abrupt in growth at the base. Popularly called "The Devil's apron." 



14 



