. Comparative morphology of Fungi. Fungi. CHYTRIDIALES 47 (so that the places of forking are markedly swollen) and anastomose frequently. The terminal or intercalary sporangia arise by swelling and cutting off hyphal portions; the adjacent hyphal portions swell like apophyses. At germination, a piece of the exospore is thrown off as a lid by the swelling endospore and the uniflagellate zoospores are liberated by a germ sac or singly. In case the sporangia germinate in the interior of a host cell, the wall of the latter is pierced by an emission collar. In addition to sporangia, hypnospores hav
. Comparative morphology of Fungi. Fungi. CHYTRIDIALES 47 (so that the places of forking are markedly swollen) and anastomose frequently. The terminal or intercalary sporangia arise by swelling and cutting off hyphal portions; the adjacent hyphal portions swell like apophyses. At germination, a piece of the exospore is thrown off as a lid by the swelling endospore and the uniflagellate zoospores are liberated by a germ sac or singly. In case the sporangia germinate in the interior of a host cell, the wall of the latter is pierced by an emission collar. In addition to sporangia, hypnospores have also been observed. A certain hypha undergoes longitudinal and transverse divisions so that. Fig. 31.—Nowakowskiella ramosa. 1. Mycelium showing numerous anastomoses and swellings which will later develop zoosporangia. Below to the left, an intercalary zoosporan- gium with bilateral apophyses. 2. Zoospores. 3. Proliferating zoosporangium, the lid is still visible in the old one. 4, 5. Primordium of hypnospores. (X 608; after Butler, 1907.) the outer cells change to thick-walled spores (Fig. 31, 4 and 5). Their germination is still unknown and their morphological significance still obscure. Both Physoderma and Urophlyclis are marked by the high develop- ment of their hypnospores which in Physoderma are spherical or ellip- soidal, in Urophlyctis flattened on one side. The peculiarities of their structure and development have been little investigated, so that their systematic classification offers great difficulties. In numerous species only the hypnospores are known. In Physoderma macuLare {Cladochyirium Alismatis) on leaves and stems of Alisma sp. (Clinton, 1902), the zoospores are uniflagellate;. 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 Gäumann, Ernst Albert, 1893-1963; Dodge, Carroll William, 18
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