fungal sheath

fungal sheath

[′fəŋ·gəl ‚shēth]
(mycology)
A compact layer of fungal hyphae that surrounds the young root surface of the host plant and prevents direct contact between the root and the soil.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
All samples were observed under a dissecting microscope for ectomycorrhizal formation determined by the presence of a fungal sheath. One hundred root tips per seedling were randomly selected from root segments.
Thirty-eight percent of our samples were categorized as ECM with black fungal sheaths and hyphae, which matched Cenococcum morphology and DNA sequence.
Chestnut tree type Surviving trees Mean HT (cm) [+ or -] SE B[C.sub.1][F.sub.3] 72% (b) 225 [+ or -] 19 (b) B[C.sub.2][F.sub.3] 80% (a) 232 [+ or -] 22 (b) American 70% (b) 296 [+ or -] 22 (a) Chestnut tree type Trees flowering Trees with cankers B[C.sub.1][F.sub.3] 40% (a) 5% (a) B[C.sub.2][F.sub.3] 38% (a) 7% (a) American 36% (a) 15% (b) Chestnut tree type % ECM B[C.sub.1][F.sub.3] 46 [+ or -] 9 (a) B[C.sub.2][F.sub.3] 59 [+ or -] 9 (a) American 56 [+ or -] 6 (a) TABLE 2: Eight-year-old chestnut trees (tree types pooled) compared by three ECM categories: (1) those with <25% ECM root colonization (n= 19), (2) colonization greater than 25% with black hyphae and sheaths (n= 18), and (3) colonization greater than 25% with white hyphae and fungal sheaths (n = 13).