. Atlas of the rare vascular plants of Ontario. Rare plants; Botany. Specimens/Specimens CAN. DAG, HAM. OAC. CACA. UWO. WAT O Pre 1925 01925-1949 31950-1964 ⢠Posf1964. Afler/D'après Little 1977, MacRoberls 1984 HABITAT: Moist to well-drained forests on sand, occasionally on heavy soils. STATUS: Rare in Canada. Possibly extirpated in Florida; endangered in Illinois and Michigan; rare in Louisiana, Maine, Maryland, Ohio, Rhode Island, Vermont, and Virginia. NOTES: Before the introduction of the chestnut blight fungus {Endothia parasitica (Murr.) Anderson & Anderson) at the beginning of th
. Atlas of the rare vascular plants of Ontario. Rare plants; Botany. Specimens/Specimens CAN. DAG, HAM. OAC. CACA. UWO. WAT O Pre 1925 01925-1949 31950-1964 ⢠Posf1964. Afler/D'après Little 1977, MacRoberls 1984 HABITAT: Moist to well-drained forests on sand, occasionally on heavy soils. STATUS: Rare in Canada. Possibly extirpated in Florida; endangered in Illinois and Michigan; rare in Louisiana, Maine, Maryland, Ohio, Rhode Island, Vermont, and Virginia. NOTES: Before the introduction of the chestnut blight fungus {Endothia parasitica (Murr.) Anderson & Anderson) at the beginning of this century, Castanea dentata was a major forest species throughout most of eastern North America. It now usually occurs only in the form of occasional stump sprouts from persistent root systems. After several year's growth, these sprouts also become susceptible to the blight and usually die from girdling cankers before reaching maturity. In Ontario, the current occurrence of remnant chestnut trees reflects their distribution recorded in 1817 (Moss & Hosking 1983). In addition to blighted trees and stump sprouts, mature trees without blight symptoms are occasionally seen. HABITAT: Forêts humides à bien drainées sur sols sablonneux, parfois lourds. SITUATION: Rare au Canada. Peut-être déracinée en Floride; menacée d'extinction en Illinois et au Michigan; rare en Louisiane, au Maine, au Maryland, en Ohio, au Rhode Island, au Vermont et en Virginie. REMARQUES: Avant l'introduction du champignon responsable de la brûlure du châtaignier {Endothia parasitica (Murr.) Anderson & Anderson) au début du siècle, Castanea dentata était une espèce importante des forêts dans la majeure partie de l'est de l'Amérique du Nord. Aujourd'hui, on ne la trouve habituellement plus que sous forme de drageons dus à la persistance du système racinaire. Après plusieurs années de croissance, ces rejets deviennent eux aussi sensibles à la brÃ
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectbotany
