The two clades constitute the " Isabelia " alliance, formed by plants that share stout columns, sometimes partially adnate to the labellum forming round nectaries, and is one of the eight clades of subtribus Laeliinae.
42.
The two can be distinguished by the narrow-stalked pinnae of " A . ?trudellii ", as the basal pinnae of " A . pinnatifidum " are broad-stalked or adnate ( fused ) with the rachis.
43.
Within the genus " Gliophorus ", it is classified in the section " Glutinosae ", a grouping of species characterized by having bright colors, decurrent gills, and a gelatinized adnate to somewhat decurrent attachment to the stipe.
44.
The attachment of the anthers to the filaments may be either peltate ( to the surface ) or pseudo-basifixed ( surrounding the filament tip, but not adnate, that is not fused ) and dehisce longitudinally and are extrorse ( dehiscing away from center ).
45.
The tubes which comprise the pore layer on the underside of the cap are deep, and have an adnate ( attached broadly to the stem ) to spores form on the inner surfaces of the tubes and sift through their openings to be borne away on the air currents outside.
46.
Finer distinctions are often made to distinguish the types of attached gills : adnate gills, which adjoin squarely to the stalk; notched gills, which are notched where they join the top of the stalk; adnexed gills, which curve upward to meet the stalk, and so on.
47.
The fruit body has a long gills of " H . olivaceoalbus " are thick, widely spaced and adnate ( broadly attached ) to decurrent ( extending slightly down the stem ); they are white ( slightly greyish on the base ), and have a waxy surface.
48.
The adnate, sometimes with a decurrent line, close, whitish, becoming grayish-cream on drying, with white, floccose remnants of partial veil on edges, narrow, 4.5-11 mm ( 0.45-1.1 cm ) broad, sometimes anastomosing; the short gills are truncate to rounded truncate to attenuate to attenuate in steps, plentiful, of diverse lengths, unevenly distributed.
49.
Flowers are bisexual, white, in axillary spreading panicles; pedicels 5-ribbed; ribs alternating with sepals; calyx tube very short, adnate to the base of the ovary; lobes 5, ovoid-deltoid, acute, pubescent; petals 5, white, oblong; stamens 15 in 2 rows; filaments short, flattened at base; anthers oblong, shortly apiculate; ovary superior, covered with large shallow pits, lepidote, 3-celled, ovules 2 in each cell; style about as long as ovary, ribbed; stigmas densely papillose, obscurely 3-lobed.
