Archive image from page 267 of Dansk botanisk arkiv (1913-1981). Dansk botanisk arkiv danskbotaniskark02dans Year: 1913-1981 Fig. 14 Cym. antarctica, from Henley Beach, S. A. a, Female flower with in- volucrum (/>) (about 2/i nat. size), b, Longitudinal section through the fruit (about 3/2 nat. size), c, Ripe fruit with 'comb' and protruding plumula (about 3/4 nat. size). Through the kindness of Mr. Black I have secured a con- siderable amount of herbarium material of Cym. antarctica from Henley Beach, S. A. and from it have been able to control his description of the female flower and fr
Archive image from page 267 of Dansk botanisk arkiv (1913-1981). Dansk botanisk arkiv danskbotaniskark02dans Year: 1913-1981 Fig. 14 Cym. antarctica, from Henley Beach, S. A. a, Female flower with in- volucrum (/>) (about 2/i nat. size), b, Longitudinal section through the fruit (about 3/2 nat. size), c, Ripe fruit with 'comb' and protruding plumula (about 3/4 nat. size). Through the kindness of Mr. Black I have secured a con- siderable amount of herbarium material of Cym. antarctica from Henley Beach, S. A. and from it have been able to control his description of the female flower and fruit, and its behaviour. The detached seedlings I found myself on the West Austra- lian coast, and also got some from Mr. Hamilton from Bun- burry; they seem to be com- monly cast ashore during the spring. At Carnarvon I hap- pened to find a seedling which was further developed and showed the manner in which the rhizome was formed (Fig. 12). By combining Mr. Black's exhaustive description and my additional observations, we are able to give the following picture of the development of the propagation: The female flower consists of two carpels, as in the other species of Cymodocea; it is terminal at the apex of the upright branches, and is sheltered by two nearly opposite normal foliage leaves. All this is typical and was seen by Ascherson (1876), but in two points the flower differs from the ordinary Cymodocea flower: the styles of the carpels divide into three stigmas (not as usually into two), and the flower is enclosed in a membranous in- volucrum (Fig. 14 a); whether this cup is a kind of perianth or — more probably — bracteoles, I cannot say. According to Mr. Black this involucrum is well developed in his P. antarctica and nearly absent in his P. Griffithii. The flowers and fruits examined by me all had a more or less well-developed involucrum. After the fertilisation the carpels begin to grow, and espe- cially four small outgrowths on their surface increase rapidly in si
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