. Plant studies; an elementary botany. Botany. TIIALLOPIIYTES: FDNGl 271 Algae ; that the sexual spore is a zygote ; and that the two pairing tip cells cut off from the main body by partition walls are gametangia. Mucor, therefore, is Fig. 338. Sexual reproduction of Jhiror, showiiiij fips of sex branches meeting (A), the two gametantria cut off by partition walls (/;), and the heavy-walled zygote (C).— 182. Peronospora.—Tliese are the " downy mildews," very common parasites on seed plants as hosts, one of the most common kind attacking grape leaves. The myceli
. Plant studies; an elementary botany. Botany. TIIALLOPIIYTES: FDNGl 271 Algae ; that the sexual spore is a zygote ; and that the two pairing tip cells cut off from the main body by partition walls are gametangia. Mucor, therefore, is Fig. 338. Sexual reproduction of Jhiror, showiiiij fips of sex branches meeting (A), the two gametantria cut off by partition walls (/;), and the heavy-walled zygote (C).— 182. Peronospora.—Tliese are the " downy mildews," very common parasites on seed plants as hosts, one of the most common kind attacking grape leaves. The mycelium is ca3noc3'tic and entirely internal, ramifying among the tis- sues within tlie leaf, and piercing the living cells with haus- toria which rapidly ahsorb their contents (Fig. 239). The presence of the parasite is made known by discolored and. 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 Coulter, John Merle, 1851-1928. New York, D. Appleton and Company
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