. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. REPRODUCTION, VEGETABLE (VEGETABLE OVUM). is no less important, as forming another^ con- necting link between the Lichens and Fungi. The special characteristic of these organs is to be found in their containing, instead of thecae or paraphyses, stylospores, supported on stipitiform pedicles or basidia. In their Fig. Pycnidis of the same, about 150 diam. The stylospores are escaping from the upper ori- fice of the organ. (The figures from 143 to 154 in- clusive, are after Tuiasne.) general form they resemble the sp
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. REPRODUCTION, VEGETABLE (VEGETABLE OVUM). is no less important, as forming another^ con- necting link between the Lichens and Fungi. The special characteristic of these organs is to be found in their containing, instead of thecae or paraphyses, stylospores, supported on stipitiform pedicles or basidia. In their Fig. Pycnidis of the same, about 150 diam. The stylospores are escaping from the upper ori- fice of the organ. (The figures from 143 to 154 in- clusive, are after Tuiasne.) general form they resemble the spermogoniae, but their walls are thicker and they are larger. Like them they are provided with a vertical ostiole. The stylospores are oblong, cylin- drical bodies, more than twice the length of the spermatia (from ^Vo to Titnr °f an inch), obtuse at both ends, very slightly curved, colourless, and containing only granular pro- toplasma. They are supported on pedicles, which have the same arrangements as in the spermogoniae. They are simple, linear tubular filaments, which taper towards their extre- mities. Just as the spermogoniae correspond to the spermatium-bearing organs of the Fungi, the pycnides correspond to those receptacles, containing stylospores, which we have had occasion to describe both in the Discomycetes and Pyrenomycetes. 50. Summary.—The reproductive organs of the Fungi and Lichens are of five kinds :— 1. Sporules, which are formed by the con- striction and subsequent separation of the extremity of a simple cylindrical filament; 2. Spermatia with their supporting pedicles ; 3. Stylospores, with their styles ; 4. Thecae or asci; 5. Basidia, with their basidiospores. Of these the last mentioned are to be found only, as we know at present, in Fungi which are provided with no other reproductive organ. The first four, on the other hand, all of them occur in plants belonging to one family of Fungi—viz. the Disco- and Pyreno-mycetes : they also all occur, with
Size: 1406px × 1777px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, booksubjectanatomy, booksubjectphysiology, booksubjectzoology
