. A practical course in botany, with especial reference to its bearings on agriculture, economics, and sanitation. Botany. 324 PRACTICAL COURSE IN BOTANY. Mycelium under the microscope and notice that it is composed of delicate filaments made up of single cells placed end to end, as in Spi- rogyra (341). These filaments are called hyphce. 370. The button. — Look on the my- celium for one of the small round bodies called buttons (Fig. 457). These are the beginning of the fruiting body popularly known as the mushroom, and are of va- rious sizes, some of the youngest being of a mushroom(AgaHcus b
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. A practical course in botany, with especial reference to its bearings on agriculture, economics, and sanitation. Botany. 324 PRACTICAL COURSE IN BOTANY. Mycelium under the microscope and notice that it is composed of delicate filaments made up of single cells placed end to end, as in Spi- rogyra (341). These filaments are called hyphce. 370. The button. — Look on the my- celium for one of the small round bodies called buttons (Fig. 457). These are the beginning of the fruiting body popularly known as the mushroom, and are of va- rious sizes, some of the youngest being of a mushroom(AgaHcus barely visible to the naked eye. After a time they begin to elongate ai their way out of the substratum. campestris), with young , buttons (fruiting organs) time they begin to elongate and make in different stages : 1, 2, 3, 4, 5, sections of fructi- fication at successive pe- 371. The veil and the volva. — Make a riods of development; m, vertical section through the center of one mycelium ; st, stipe ; p, ° piieus; i, gill, or lamina; of the larger buttons after it is well above ground, and sketch. Notice whether it is entirely enveloped from root to cap in a covering membrane — the volva (Fig. 458, a) — or whether the enveloping mem- brane extends only from the upper part of the stem to the margin of the cap — the veil (Fig. 458, d); whether it has both veil and volva, or finally, whether it is naked, that is, devoid of both. 372. The stipe, or stalk.— Notice this as to length, thick- -J ness, color, and position; that is, whether it is inserted in the center of the cap or to one side (excentric), or on one edge (lat- eral). Observe the base, whether FlG. 458. - Diagram of unex- bulboUS, tapering, Or Straight, Panded Amanita, showing parts: a, -, , . n iii volva; 6, piieus ; c, gills; d, veil; e, and whether surrounded by a stipe; m, mycelium.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readabilit