ENGLISH 31 
[f645, 646, g315, s777]. 
701 nerve — see costa; midrib [f647, g851, $780]. 
702 — lying eei in a cavity; partially encased; e.g., budlike plants of Ephemerum on 
E | mat; gemmae of Marchantia in cups [f649, g706, s783]. 
703 nitrophilous — preferri ich in nitrogenous compounds [f650, g707, s784]. 
704 sedem -- with short knob-like thickenings; e.g., endostomial cilia in many Bryum species 
(cf. appendiculate) [f655, g584, s787]. 
705 nodular thickenings — knob-like enlargements; usually applied to the radial wall 
thickenings that appear as pigmented knobs on exothecial cells when seen in surface view 
[[352, g584, s3 
706 nodulose — with sédulsé thickenings; minutely knobbed; sometimes referred to 
intracellular wall thickening; e.g., Racomitrium (cf. appendiculate) [f652, g581, s786]. 
707 nonarticulate — not in coin even tiers; e.g., epidermal cells of setae; not jointed, 
without thicl (opposed to articulate) [519, g1036, s645]. 
708 nurse cells — sterile archésporisl cells that presumably provide nourishment to developing 
sporocytes and spores (see tapetum); found in Sphaerocarpales, Ephemerum, Archidium 
[f175, g696, s202]. 
709 nutant — nodding, drooping [f657, g702, s789]. 
O 
710 obconical — conical with the narrow end at the base [f658, g1062, $790]. 
711 oblate — wider than long [f1096, g-apx, s791]. 
712 oblique — slanted; e.g., an oblique leaf insertion is one that is between transverse and 
longitudinal [f659, g901, s792]. 
713 oblong — rectangular with rounded corners or ends [f660, g619, s793]. 
714 obovate — egg-shaped with apex broader than base [f661, g1060, 8794]. 
715 obovoid — an inversely ovoid solid [f662, g1060, 795]. 
716 obscure — indistinct; often applied to cells with dense cytoplasmic inclusions or dense 
papillae making cell walls difficult to see [f663, g1034, s796]. 
717 obsolete — scarcely evident, almost lacking; usually referring to the costa [f664, g1034, 
s797]. 
718 obtuse — broadly pointed, more than 90? - used by some authors to mean blunt or 
rounded [f665, g988, s798]. 
719 ocellus (pl. ocelli) — an idioblastic leaf cell having one large oil body and lacking 
chloroplasts, also found in underleaves, bracts and perianths of certain leafy liverworts 
(Frullania, certain Lejeuneaceae) [f666, g726, $799]. 
720 ochraceous -- ochre-colored, brownish yellow [f667, g713, s800]. 
721 ochrea — vaginula, or upper part of vaginula [f668, g877, s801]. 
722 octofarious — eight-ranked [f669, g16, s802]. 
723 oil body — a membrane-bound, terpene-containing organelle unique to the cells of 
liverworts [f672, g715, s305, 804]. 
oil cell — an idioblastic cell characterized by a very large oil body, common in thalloid 
