. Introduction to cryptogamic botany. Cryptogams. 144 INTRODUCTION TO CETPTOGAMIC BOTANY. I have a beautiful species which has its seat on old bones in South Carolina. The most singular habit is, however, pos- sessed by one genus, analogous to that of the larger floating Algae. But instead of forming circumscribed patches, it spreads for many miles over the surface of the sea, according to the direction of the wind, in the form of a red brown scum, the little faggots of threads of which it is composed, resem-. Fig. 36. Tridiodesmium erythraium, Ehr. Magnified from specimens collected by Mr. Da
. Introduction to cryptogamic botany. Cryptogams. 144 INTRODUCTION TO CETPTOGAMIC BOTANY. I have a beautiful species which has its seat on old bones in South Carolina. The most singular habit is, however, pos- sessed by one genus, analogous to that of the larger floating Algae. But instead of forming circumscribed patches, it spreads for many miles over the surface of the sea, according to the direction of the wind, in the form of a red brown scum, the little faggots of threads of which it is composed, resem-. Fig. 36. Tridiodesmium erythraium, Ehr. Magnified from specimens collected by Mr. Darwin, compared with Dr. Montague's analysis in Ann. d. Sc. Nat., Ser. 3, vol. ii. tab. 10. bling minute fragments of chopped hay. It is even conjectured that the Red Sea may have acquired its denomination from this little Alga, which is very prevalent there, and forms a conspicuous object to all observing navigators.* It is curious that, in some instances, this scum emits a disagreeable pungent smell, affecting strongly the mucous membrane, and thereby causing temporary inflammation of the eyes and troublesome sneezing. The property of emitting an unpleasant odour is * One of the earliest notices of this phenomenon is in Osbeck's Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Berkeley, M. J. (Miles Joseph), 1803-1889. London, New York, H. Bailliere; [etc. ,etc]
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