. The structure and development of mosses and ferns (Archegoniatae). ymenophyllum (sp). Margin of a prothallium with numerous gemmae k;X8s; B, a young gemma, X260; st, its stalk. develop a flat thallus, but may remain filamentous, and eachray may produce antheridia either terminally or laterally (, C). In case a flat thallus is formed, only one or some-times two of the rays grow out in this form, the other havingonly a limited growth, and terminating in a short rhizoid. Inshort, the process is very similar to that in the germinatingspores. 376 MOSSES AND FERNS CHAP. The Sexual Organs Bo
. The structure and development of mosses and ferns (Archegoniatae). ymenophyllum (sp). Margin of a prothallium with numerous gemmae k;X8s; B, a young gemma, X260; st, its stalk. develop a flat thallus, but may remain filamentous, and eachray may produce antheridia either terminally or laterally (, C). In case a flat thallus is formed, only one or some-times two of the rays grow out in this form, the other havingonly a limited growth, and terminating in a short rhizoid. Inshort, the process is very similar to that in the germinatingspores. 376 MOSSES AND FERNS CHAP. The Sexual Organs Bower (8) has investigated the structure of the anther-idium in Trichomanes, and Goebel (lo) in both Trichomanesand Hymenophyllum. My own study of their developmenthas been confined to an undetermined species of Hymenophyl-lum from the Hawaiian Islands, but the results of my observa-tions agree entirely with those of other observers. The anther-idia arise mainly upon the margin of the prothallium, or uponthe ends of the filamentous ones. After the mother cell is cut.
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