A text-book of mycology and plant pathology . metes formed from the samemycelium (homogamic hermaphrodites) or by the union of two slightlydissimilar gametes the product of the same mycelium (heterogamic her-mophrodites), or it arises by the conjugation of similar gametes (+ and— races) from two distinct mycelia (heterothallic and homogamic).7 98 MYCOLOGY The important genera of the family are Mucbr, Rhizopus, Phycomy-ces, Absidia, Sporodinia, Thamnidium, Dicranophora, Pilaira dind Filo-bolus. The genus Mucor, a key for the identification of the species willbe given at the end of the book, was
A text-book of mycology and plant pathology . metes formed from the samemycelium (homogamic hermaphrodites) or by the union of two slightlydissimilar gametes the product of the same mycelium (heterogamic her-mophrodites), or it arises by the conjugation of similar gametes (+ and— races) from two distinct mycelia (heterothallic and homogamic).7 98 MYCOLOGY The important genera of the family are Mucbr, Rhizopus, Phycomy-ces, Absidia, Sporodinia, Thamnidium, Dicranophora, Pilaira dind Filo-bolus. The genus Mucor, a key for the identification of the species willbe given at the end of the book, was established in 1729 by genus may be divided into three groups of species. The firstdivision includes those species with unbranched sporangiophores, suchas Mucor mticedo. The second group comprises the moulds with clus-tered branches of the sporangiophores, as Mucor corymbifer, M. erectus/-^M. fragilis, M. pusillus, M. racemosus, and M. tenuis. The third sec-tion is made up of species the sporangiophores of which show sympodial. Fig. 30.—Details of Chlamydomiicor racemosus showing oidia, sporangia and spore formation. zygo- branching. Such are Mucor alternans, M. circinelloides, M. javanicus,M. Rouxii and M. spinosus. (Also consult pages 695-702.) The oldest known species, Mucor mticedo, was described fully for thefirst time by O. Brefeld in 1872. Stiff sporangiophores, 3° to 40/zthick, arise from the mycelium and are 2 to 15 cm. in height. Eachbears a single globular sporangium 100 to 200^1 in diameter and thesporangial wall is beset with fine needles of calcium oxalate. The sporesare ellipsoidal 3 to 6^ by 6 to 12/x with faint yellowish cell contents. Aspreviously described, conjugation is between two similar gametes from+ and — mycelia. Mucor racemosus, also known as Chlamydomucor MOULD FUNGI 99 racemosus (Fig. 30), shows the clustered branching of the sporangio-phore and in addition the hypha^ are marked by the intercalary forma-tion of chlamydospores. Th
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