. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. SCHIZAEACEAE 545 more likely that the sporangia are originally of surface origin. Nor does it appear unlikely that there should be inconstancy in this respect within the family, when it is remembered that the sporangia may be either marginal or superficial in the Osmundaceae. The sporangia are large and sessile, or in Lygodium shortly stalked, and are annulate. The annulus in the living forms is usually uniseriate,. Fiu. 302. Sporangia of the Schizaeaceae. A, B = ScIiizaca f>en>inla, Sw. A seen
. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. SCHIZAEACEAE 545 more likely that the sporangia are originally of surface origin. Nor does it appear unlikely that there should be inconstancy in this respect within the family, when it is remembered that the sporangia may be either marginal or superficial in the Osmundaceae. The sporangia are large and sessile, or in Lygodium shortly stalked, and are annulate. The annulus in the living forms is usually uniseriate,. Fiu. 302. Sporangia of the Schizaeaceae. A, B = ScIiizaca f>en>inla, Sw. A seen laterally. B the tip seen obliquely from above. C' = Lygodium japonicmn, Sw., seen laterally. D. E — Mohria cajfrorvm (L) Desv. />-seen from above. E, laterally. F, G = Aneimia Phyltitidis, Sw. F=\icw from midrib, G from margin of pinnule. //-/.=spores of the Schizaeaceae. H = Sckizaea pennula, Sw. J' = Lygodium japonicnm, Sw. K= Mohria caffrorum (L) Desv. L = Aneimia fulva, Sw. (All but A" after Prantl. K, after Diels—from Engler anil Prantl, Nat. PJlanzcnfam.) though occasionally it is more complex : it is contracted towards the apical end of the sporangium, and there is a definite stomium ; but however contracted it may appear, there is in its centre an apical group of thin-walled cells (or it may be only a single one in Lygodium and Schizaed), designated by Prantl the " ; It is important to note its existence for comparison with sporangia of other Ferns. The rest of the sporangial wall is 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 Bower, F. O. (Frederick Orpen), 1855-1948. London, Macmillan and Co. , Ltd.
Size: 1606px × 1557px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisherlondonmacmillanand
