. Plant studies; an elementary botany. Botany. 260 I'LAXT STUDIES tinguish them from tlie ciliato(l sperms, or spermatozoids, which have the power of locomotion, these motionless male gametes of the lied Algas are usually called spcrmatia (singular, uperinatinni) (Fig. , .1, .s-). The oogonium is very pe- culiar, being differentiated into two regions, a bulbous base and a hairdike jDrocess {trifhdffi/ne), the whole struc- ture resembling a Hask with a long, narrow neck, excepting that it is closed (Fig. 328, A, oj). Within the Imlbous j)art the egg, or its equivalent, is organized; a si)er
. Plant studies; an elementary botany. Botany. 260 I'LAXT STUDIES tinguish them from tlie ciliato(l sperms, or spermatozoids, which have the power of locomotion, these motionless male gametes of the lied Algas are usually called spcrmatia (singular, uperinatinni) (Fig. , .1, .s-). The oogonium is very pe- culiar, being differentiated into two regions, a bulbous base and a hairdike jDrocess {trifhdffi/ne), the whole struc- ture resembling a Hask with a long, narrow neck, excepting that it is closed (Fig. 328, A, oj). Within the Imlbous j)art the egg, or its equivalent, is organized; a si)ermatiiim at- taches itself to the trichogyne (Fig. 228, J, .y); at the point of contact the two walls become perforated, and the contents of the spermatium thus enter the trichogyne, and so reach the bulbous base of the oogo- nium. The above account represents the very simplest conditions of the process of fertilization in this group, and gives no idea of the great and puzzling complexity exhibited by tlie majority of forms. After fertilization the trich- ogyne wilts, and the bull)ous l) ill one way or another de- velops a conspicuous structure called tlie njtitwarp (Figs. 228, 229), which is a case con- taining asexual spores ; in other words, a spore case, or kind of sporangium. In the life history of a red alga, there-. n. 2--,'l), A liVilllcll of / <li/s't ilifui'in. one o th n-d algi. \uns WJ, th.' r<")ws .r (â 'lis eonipi -â ii i.' 11 â 1 <Hiy (.1). sm;ill bninchei? n ⢠ha rs /l). .ami a cystocurp {(.') W 111 (⢠(â a liiiu; spores {!» which hav ' lo v\ ia ( car- pogpoi v^) â( ' ,1,. 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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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1900
