. The Canadian field-naturalist. Natural history. 2002 Mann and Raju: The Charophyte Nitella macounii 565. Figure 2. A. SEM photo of tuberculate dark orange-brown oospore. Scale bar = 40 micrometers. B. Enlarged SEM photo of tuberculate oospore membrane, flaring contiguous bases of tuberculae seen in upper por- tion of photo. Scale bar = 25 micrometers. C. Light photo of a pale orange-brown oospore membrane showing discontinuous reticulation, "rotten fishnet" appearance. Scale bar = 25 micrometers. D. Light photo of golden-yellow oospore membrane showing a fine naticulate mesh. Scale
. The Canadian field-naturalist. Natural history. 2002 Mann and Raju: The Charophyte Nitella macounii 565. Figure 2. A. SEM photo of tuberculate dark orange-brown oospore. Scale bar = 40 micrometers. B. Enlarged SEM photo of tuberculate oospore membrane, flaring contiguous bases of tuberculae seen in upper por- tion of photo. Scale bar = 25 micrometers. C. Light photo of a pale orange-brown oospore membrane showing discontinuous reticulation, "rotten fishnet" appearance. Scale bar = 25 micrometers. D. Light photo of golden-yellow oospore membrane showing a fine naticulate mesh. Scale bar = 25 micrometers. tina taxon designated as N. stuartii (Carl de Donterberg and Rotman 1973), the Chinese A^. stuar- tii taxon is reported to be octoscutate. It has been demonstrated that tetrascutate and octoscutate mem- bers of a "species group" are reproductively isolated in Chara (Proctor et al 1971). Such a major struc- tural difference in a gametangium probably suggests reproductive isolation in the genus Nitella as well, supporting the view that the entire N. stuartii com- plex needs re-evaluation. John and Moore (1987) also suggest that the A', stuartii species as it is presently constituted needs reappraisal. At this time it is not possible to be any more defi- nite about the taxonomic relationships o\' N. macounii. In light of more recent concepts of evolu- tionary pathways (Proctor 1980; Meiers el al. 1999) it is clear that some oi' Wood's (1905) views on rela- tionships are no longer tenable and that a reappraisal of the entire genus using modern concepts and tech- niques 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 Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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