. Plants; a text-book of botany. Botany. TU : FUNGI 55 Algae ; that the sexual spore is a zygote ; and that the two pairing tip cells cut ofE from the main body by partition walls are gametangia. Mucoid therefore, is Fig. 38. Sexual reproduction of Jf'/ror. showing tips of sex branches meeting (A), the two gametangia cut off by partition walls IB), and the heavy-walled zygote (O-—Caldwell. J-1. Peronospora.—These are the " downy mildews," very common parasites on seed plants as hosts, one of the most common kind attacking grape leaves. The mycelium is coeno-
. Plants; a text-book of botany. Botany. TU : FUNGI 55 Algae ; that the sexual spore is a zygote ; and that the two pairing tip cells cut ofE from the main body by partition walls are gametangia. Mucoid therefore, is Fig. 38. Sexual reproduction of Jf'/ror. showing tips of sex branches meeting (A), the two gametangia cut off by partition walls IB), and the heavy-walled zygote (O-—Caldwell. J-1. Peronospora.—These are the " downy mildews," very common parasites on seed plants as hosts, one of the most common kind attacking grape leaves. The mycelium is coeno- cytic and entirely internal, ramifying among the tissues within the leaf, and piercing the living cells with haustoria which rapidly absorb their contents (Fig. 39). The pres- ence 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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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1900
