Organography of plants, especially of the archegoniatae and spermaphyta . is hygrophilous we should notexpect a special envelope to the archegonium, and I have found no trace of In response to what stimulus ? - See p. 73. I examined two species which I collected in South America, and the Canary Islandspecies D. irrigua. 88 FERTILE SHOOTS IN HEPATICAE it, and in this I differ from Leitgeb ^ The cap of the archegoniophore isnot provided at the time of fertilization with rays, but is only slightly nickedat the edge. The rays which appear later are a consequence of the strongdevelopment of the per
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