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10a genus of filamentous green algae of the order zygnemateles, named for their helical structure (9)
18a creator god of ancient egypt, husband of sekhmet and father of nefertum (4)
36a hindu system of physical excercises combining difficult postures with controlled breathing (5,4)
38a british mathematician, whose 'an investigation of the laws of thought' established an eponomous form of algebra (6,5)
2d any of the filaments that make up the body (mycelium) of a fungus (5)
4d external 9especially upper) part of the ear; the auricle (5)
5d small tufted beard growing below the lower lip, popularised by napoleon iii of france (8)
7d shipping forecast area in the english channel off the coast of hampshire and sussex, between portland in the west and dover in the east (5)
13d small russian pancakes made from buckwheat flour and yeast, typically served with sour cream (5)
15d photographic process with an image produced on iodine-sensitized silver and developed in mercury vapour (13)
18d celestial object, thought to be a rapidly rotating neutron star, that emits regularbursts of polarized radiation; first observed in 1967 (6)
20d any venomous american pit viper of the genera crotalus and sistrurus (11)
23d 2008 liam neeson action film followed by two sequels (5)
24d notes of a chord played in rapid succession, either ascending or descending (8)
26d 1988 black comedy film starrring winona ryder, christian slater and shannen doherty (8)
30d hebrew patriarch of the old testament, son of jacob and zilpah (5)
35d improvised jazz singing, the voice is used in imitation of an instrument (4)