. The commonly occuring wild plants of Canada [microform] : a flora for the use of beginners. Botany; Plants; Botanique; Plantes. 254 (JOMMOX CANADIAN WILD PLANTS. Ik. ,; in Polypody. Observe, then, that in Polypody the sori are not covered, whilst in Pteris the opposite is the case. The covering of the fruit-dots is technically known as the Indusium. The individual spore-cases are alike in both plants Fig. 2G4 shows a frond of one of our commonest Shield-Ferns (Aspidium acrostichoides). It is simply pinnate. The stipe is thickly beset with rusty-looking, chafF-like scales. The veins are free,
. The commonly occuring wild plants of Canada [microform] : a flora for the use of beginners. Botany; Plants; Botanique; Plantes. 254 (JOMMOX CANADIAN WILD PLANTS. Ik. ,; in Polypody. Observe, then, that in Polypody the sori are not covered, whilst in Pteris the opposite is the case. The covering of the fruit-dots is technically known as the Indusium. The individual spore-cases are alike in both plants Fig. 2G4 shows a frond of one of our commonest Shield-Ferns (Aspidium acrostichoides). It is simply pinnate. The stipe is thickly beset with rusty-looking, chafF-like scales. The veins are free, as before. The so7'i or fruit-dots are on the back of the upper pinnoe, but they are neither collected in naked clus- ters, as in Polypody, nor are they covered by the edge of the frond as in the Brake. Here each cluster has an iudusium of its own. The indusium is round, and attached to the frond by its depressed centre (peltate). Fig. 265. shows an en- larged portion of a pinna, with the sporan- gia escaping from beneath the indusium. From one forking vein the sporangia are stripped off to show where they have been attached. The separate sporangia discharge their spores in the manner represented in the account of Polypody. In some Ferns the fruit-dots are elong- ated instead of being round, and the indusium is attached to the frond by 07ie edge only, being free on the other. Sometimes two long fruit-dots will be found side by side, the free edges of the indusia being towards each other, so that there is the appearance of one long fruit-dot with an indusium split down the centre. Fig. 266 represents a frond of a very common swamp Fern, Onoclea Sensibilis,. 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 Spotton, H. B. (Henry Byron), 1844-1933. Toronto : W. J. Gage
Size: 828px × 3018px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubjectbotany, booksubjectplants, bookyear18
