ENGLISH 23 
526 hyalocyst — large, empty, water-storage cell as in leaves of Sphagnum and Leucobryum, 
and in many endohyalocysts (interior to teniole; opposed to chlorocysts) [f497, g491, 
s605]. 
527 hyalocyte — a cell that rdiscso gem vi a wen abis gh, s606]. 
528 hyalodermis (pl. hyal ] external cells; e.g., 
thickwalled, enlarged or hyaline; stem epidermis of enlarged, hyaline cells; i.e., 
chloroplasts very few or lacking; such cells may be protoplasmic (e.g., Cephalozia) or not 
(e.g., Sphagnum) at maturity [f499, g490, s607]. 
528a hydric — wet; referring to habitat [f500, g493, s608]. 
529 hydroid — tracheid-like conductive cell in the central strand of some bryophytes, especially 
mosses, sometimes also in the costa (see leaf trace) [(501, g494, s611]. 
530 hydrome — the sheath or column of hydroid tissue in the stem; the central or axillary 
strand [f502, g495, s612]. 
531 hydrophilous — growing in water; loving water [f503, g496, s609]. 
532 hydrophyte — aquatic plant, partly or completely immersed [f504, g497, s610]. 
533 hygrometric — see hygroscopic [f505, g498, s614]. 
534 hygrophyte — marsh plant, of wet habitats but not in water [f506, g499, s613]. 
535 hygroscopic — responding to humidity changes; e.g., peristome teeth [f507, g500, s616]. 
536 hylacolous — dwelling on bark [f1083, g501, s287, 1166]. 
537 hylodophilous - thriving in dry open woodlands [f1084, g502, s1 162]. 
538 hylophilous — thriving in forests [1085, g503, s778, 1047]. 
539 hypnoid — having a complete peristome; occasionally used to refer to a moss with a 
pleurocarpous habit i.e., Hypnum cupressiforme (see -oid) [£508, g504, s618]. 
540 hypobasal — the lower initial (cell) of the two-celled embryo [f509, g505, s619]. 
541 hypodermal — one or more layers of differentiated cells beneath the epidermis of the stem 
(cf. cortex) [f510, g506, s620]. 
542 hypogonianthus (pl. hypogonianthi) — applied to a three keeled perianth with two lateral 
and one ventral or postical keels (opposed to epigonianthus) [f511, g507, s622]. 
543 hypophysis (pl. hypophyses) — a strongly differentiated, sterile neck at the base of the 
capsule, between seta and urn (also called an apophysis); e.g., Trematodon, Splachnum 
[f69, 2508, s621]. 
544 hypostatic — lobules of male bracts overlapping ventrally, imbricate; (opposed to 
epistatic) [f1086, g509, s623]. 
I 
545 icon (pl. icones) — a plate, drawing or engraving [f512, g-, $640 
546 idioblast — an uniquely differentiated cell, distinct from other cells of the same tissue in 
size, form and/or contents; e.g., ocellus, oil-cell [f513, g511, s641]. 
547 imbricate — closely appressed and overlapping; e.g., with the leaf margins overlapping like 
shingles on a roof [f514, g59, 196, s642]. 
548 immarginate — without a border (see elimbate) [f515, g1037, s662]. 
549 immersed — submerged or below the surface; referring to a capsule or perianth exceeded 
