. Plant studies; an elementary botany. Botany. 32^ PLANT STUDIES and archegonia appear, so that it is evidently a gameto- pliyte. This gametoplayte escapes ordinary attention, as it is usually very small, and lies prostrate upon the substra- tum. It has received the name iri-iAhalliuiii or pi'othallium, so that v;\\eii the term prothallium is used the gametop)hyte of Ptoridophytes is generally referred to ; just as when the term sporogouium is used the sjjorophyte of the Bryophytes is referred to. Within an archegonium borne upon this little prothallium an oospore is formed. \\'licu the oospor
. Plant studies; an elementary botany. Botany. 32^ PLANT STUDIES and archegonia appear, so that it is evidently a gameto- pliyte. This gametoplayte escapes ordinary attention, as it is usually very small, and lies prostrate upon the substra- tum. It has received the name iri-iAhalliuiii or pi'othallium, so that v;\\eii the term prothallium is used the gametop)hyte of Ptoridophytes is generally referred to ; just as when the term sporogouium is used the sjjorophyte of the Bryophytes is referred to. Within an archegonium borne upon this little prothallium an oospore is formed. \\'licu the oospore ger- -'ic;. â »>?, Prcifha ihizc ids u-h\. L^IIIM |]liyti', Aftrr Sl. inm of a common fern iA-yidhim): A. ^fnrral sui-facc anlliiTidia l(//o. and arclK-uonia uif} : IJ. \cntial surface o1 slinwing rhizoids {/â h} and young sporopliytu with root {iv HENCK. sliowing an and leaf minates it develops the large leafy plant ordiiuirily spoken of as "the fern," with its suliterranean stem, from which roots descend, and from which large branching leaves rise above the surface of the ground (Fig. 203, /I). It is in this complex body that the vascular system a|)])ears. A'o sex organs are developed upon it, but the leaves bear numer- ous sporangia full of asexual spores. Tliis complex vascular plant, therefore, is a sporophyti', and corres])(inds in this life history to the sporogonium of the ISryophytes. This. 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 Coulter, John Merle, 1851-1928. New York, D. Appleton and Company
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