. Lessons in nature study. Nature study. 12: NATURE 3TUDY. them, prothallia can be raised in the school- room and ferns grown from the prothallia. This will prove very interesting and in- structive. The spores may be collected by placing the spore-b earing leaves on sheets of paper, and letting the leaves dry, when the spores will be dis- charged, covering the paper as a fine, brown T -j-f. , Fig. 76. A single spore-bearing organ of a fern highly powder, it the spores magnified. Taken from one of tie dots shown in fig. 75. At ^ ,, S is a spore escaping. are sown on tine,rather closely-packed e
. Lessons in nature study. Nature study. 12: NATURE 3TUDY. them, prothallia can be raised in the school- room and ferns grown from the prothallia. This will prove very interesting and in- structive. The spores may be collected by placing the spore-b earing leaves on sheets of paper, and letting the leaves dry, when the spores will be dis- charged, covering the paper as a fine, brown T -j-f. , Fig. 76. A single spore-bearing organ of a fern highly powder, it the spores magnified. Taken from one of tie dots shown in fig. 75. At ^ ,, S is a spore escaping. are sown on tine,rather closely-packed earth, and kept moist, and covered with glass BO as to prevent evaporation, a fine green, moss-like growth will make its appearance in a week or two, and by the end of five or six weeks, the little flat, heart-shaped plants spoken of before as the first stage will appear. They are of a dark green color, and are the prothallia. These prothallia are attached to the ground by fine root-hairs. Very soon we may find growing from the under side of some of the larger of these little plants the fern as we know it. It is attached to the ground as well as to the pro- thallium (fig. 78). As the plant grows, the prothallium dies, leav- ing the fern as an independent plant, which afterwards bears the spores. The reproductive organs are on the under-side of the prothal- lium as shown in figure 77. Th§se can be readily made out with a hand lens if the pupils are old enough to appreciate this 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 Jenkins, Oliver Peebles; Kellogg, Vernon L. (Vernon Lyman), 1867-1937. joint author. San Francisco, The Whitaker & Ray Company
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