Elementary botany . Fig. 299 Spore of Aspidiumacrostichoides withwinged exospore. Fig. 300. Spore crushed to remove exospore andshow endospore. 264 MORPHOLOG Fig. of asplenium ; exospore removed from the one at the right. point. A spore of the Christmas fern is shown in fig. 299. Theouter wall here is more or less winged. At fig. 300 is a spore of the same species from which theouter wall has been crushed, showingthat there is an inner wall also. Ifpossible we should study the germi-nation of the spores of some fern. 552. Germination of the spores.—After the spores have been sow
Elementary botany . Fig. 299 Spore of Aspidiumacrostichoides withwinged exospore. Fig. 300. Spore crushed to remove exospore andshow endospore. 264 MORPHOLOG Fig. of asplenium ; exospore removed from the one at the right. point. A spore of the Christmas fern is shown in fig. 299. Theouter wall here is more or less winged. At fig. 300 is a spore of the same species from which theouter wall has been crushed, showingthat there is an inner wall also. Ifpossible we should study the germi-nation of the spores of some fern. 552. Germination of the spores.—After the spores have been sown forabout one week to ten days we shouldmount a few in water for examinationwith the microscope in order to studythe early stages. If germination has begun, we find that hereand there are short slender green threads, in many cases attached to brownish bits, the oldwalls of the one will sow thesporangia along with thespores, and in such casesthere may be found anumber of spores stillwithin the old sporan-gium wall that are ger-minating, when they willappear as in fig. 302. 553. Pr-otonema. —These short green threadsare called protonemal t
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