ENGLISH 21 
481 gregarious -- growing together in loose tufts or mixed mats [f459, g392, $575]. 
482 guard cells — specialized cells bordering an opening in the capsule wall; (see stoma). 
[f176, g891, s214]. 
483 guide cells — large, highly vacuolated, thin-walled and longitudinally arranged cells found 
in a median layer across the costa of many mosses, part of conducting parenchyma; e.g., 
taxa of Pottiaceae characteristically have guide cells sandwiched between two layers of 
stereid cells in the costal cross-section (sometimes referred to as interstereid cellis, 
deuters, central cells, and socii) [f169, g201, s212]. 
484 guttulate — with cell lumen rounded because of strong wall thickening; resembling drops 
of oil or resin [f462, g1023, s576]. 
485 gymnostomous -- lacking a peristome [f463, g752, s563]. 
486 gynoecial branch -- a specialized archegonia-producing branch [f828, g424, s967]. 
487 gynoecium (pl. gynoecia) —- the female gametoecium, consisting of archegonia and the 
surrounding bracts (perichaetial leaf or involucre); the "female inflorescence." [f464, 
g425, s564]. 
488 gynogametophyte — infrequently used term for female gametophyte (see andro-, 
androgynogametophyte) [f465, g426, s550, 565]. 
489 gyrate — curved into a spiral, circinate [f86, g605, s567]. 
490 gyrothecal —- with a sheath of tissue; found at the base of endogenous and certain 
exogenously developed, collared branches in some liverworts [f438, g427, s568, 968]. 
H 
491 habit — the aspect or general appearance of a plant [f467, g434, s578]. 
492 habitat —- local environment [f466, g433, s577]. 
493 hair-point — see awn, arista [f83, g432, s846]. 
494 halophyte -- plants that grow on salty or alkaline soil [f468, g442, s580]. 
495 hamate (hamulose) —- hook shaped; more abruptly curved than falcate [f469, g437, s581]. 
496 haploid — a cell, structure or organism having a single set of chromosomes (n); e.g., the 
normal chromosome level of the gametophyte generation [f470, g445, 582]. 
497 haplolepidous (haplolepideous)-- form of arthrodontous peristome; (originally) - having 
main teeth formed from a single column of cells up dorsal face; (strictly) - having only 
one circle of teeth derived from thickening of the contiguous walls of the primary and 
inner peristomial layers [homologous to the inner diplolepidous circle, endostome]; also a 
member of the Haplolepidae; (opposed to diplolepidous; see sesquilepidous) [f471, g446, 
s583 
498 hastate —- spear-shaped; abruptly broadened and auriculate at base [f472, g938, s584]. 
499 haustorial collar — an expansive, absorptive surface at the upper end of the foot that 
increases the surface area in contact with the gametophyte (syn involucellum) [f749, g448, 
s303]. 
500 haustorium (pl. haustoria) — an elongate cell(s) at the base of the foot, most prominent 
in the embryonic sporophyte; thought to function in absorption during early stages of 
sporophyte growth [f473, g449, s585]. 
