. The Canadian field-naturalist. 1989 Mann: Charophytes of Insular Newfoundland 39. Figure 3, Distribution of (L.) Ag. and N. gracilis f. confervacea Breb. in insular Newfoundland. ⢠= monoecious N. flexilis â = non-fruiting N. flexilis A = dioecious N. opaca O - N. gracilis f. convervacea plants do not otherwise correspond to the descriptions of v. spanioclema and all collections are considered to be v. flexilis. Two of Wood's (1965) forms are represented in the present study in addition to the most common Slender, lax plants with long dactyls and with branchlets much
. The Canadian field-naturalist. 1989 Mann: Charophytes of Insular Newfoundland 39. Figure 3, Distribution of (L.) Ag. and N. gracilis f. confervacea Breb. in insular Newfoundland. ⢠= monoecious N. flexilis â = non-fruiting N. flexilis A = dioecious N. opaca O - N. gracilis f. convervacea plants do not otherwise correspond to the descriptions of v. spanioclema and all collections are considered to be v. flexilis. Two of Wood's (1965) forms are represented in the present study in addition to the most common Slender, lax plants with long dactyls and with branchlets much longer than axial internodes may be considered f. longifolia. Those with fertile whorls compacted into head-like units may be considered f. nidifica. Wood (1965) does not attach much significance to these forms, as they appear to fall within the normal variation range of the species and the degree to which environment and/or genetics are involved in their expression is not clear. The N. flexilis complex is one of the most cosmopolitan of this genus and one with the broadest ecological amplitude (Olsen 1944; Corillion 1957; Langangen 1974). The present study shows it to be widespread and common in ponds and streams throughout the island. It has commonly been found in the same general locations as C. globularis f. virgata, often in acid waters, but also sometimes in alkaline, calcium- rich waters in association with f. virgata and C. vulgaris f. contraria. Previous reports of dioecious collections occur from the Exploits River in central Newfoundland (Wood 1965), from a bog pond on the Avalon Peninsula (Smith 1970), and from a shallow pool of a sloping fen near North Harbour on the Avalon Peninsula (Todd Howell, personal communication and specimens). These three reports are included on the distribution map, Figure 3. 5. Nitella gracilis (Sm.) Ag., f. confervacea Breb., em. (= N. batrachosperma Braun, = N. Nord- stedtiana Groves, H. & J. = TV. confervacea A. Br.) Thi
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