. Fungi, ascomycetes, ustilaginales, uredinales. Fungi. io8 DISCOMYCETES [CH. centimetres or more across as in P. vesiculosa. The genus Humaria includes similar but smaller species, often less than one centimetre in diameter. In Otidea the sides of the ascophore are laterally split, or vertically incurved and wavy. In Acetabula and Geopyxis the ascophore is stalked. In Lachnea, as well as in some other genera, the fruit is beset with hairs and in Sepultaria it is hairy and more or less sunk in the soil. Lachnea stercorea is a small orange species occurring during the winter and spring on the d
. Fungi, ascomycetes, ustilaginales, uredinales. Fungi. io8 DISCOMYCETES [CH. centimetres or more across as in P. vesiculosa. The genus Humaria includes similar but smaller species, often less than one centimetre in diameter. In Otidea the sides of the ascophore are laterally split, or vertically incurved and wavy. In Acetabula and Geopyxis the ascophore is stalked. In Lachnea, as well as in some other genera, the fruit is beset with hairs and in Sepultaria it is hairy and more or less sunk in the soil. Lachnea stercorea is a small orange species occurring during the winter and spring on the dung of various animals, especially of cows. With Humaria granulata and Ascobolus ftirfuraceus, it is among the very common coprophilous forms, appearing in many parts of Britain with great regularity when the Piloboli have died down, and the cow pad is beginning to dry. It is about 4 mm. in diameter and is furnished with numerous stout, septate hairs. The archicarp arises as a side branch from the vegetative mycelium, and divides to form four or more cells. The terminal cell or oogonium is oval in shape and larger than the others. It contains between two and three hundred nuclei and is filled with finely granular cytoplasm. In the cell next below the oogonium, the cytoplasm is also more dense and the nuclei more numerous than in the other cells of the fertile branch. Hyphae grow up from the lower cells of the archicarp, and from the branch which bears it, and form a dense weft above which the oogonium Fig. 65. Lachnea stercorea (Pers.) Gill.; a. young archicarp, x 800; b. archicarp and antheridium, X500; P. Highley del. The oogonium sends out either laterally, or from its apex, a stout branch or trichogyne. It is cut off by a wall and divides into four to six cells, the terminal of which is much larger than the others (fig. 6s«). The tip of the trichogyne protrudes for a time beyond the developing sheath, but later, with the whole fertile branch, it is enclosed by vege
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfungi, bookyear1922
