all the answer are trees or have a tree in the answer
26)You will find this one in a keyboard, similar but smaller than a harpsichord (4) 32)Shine after bony outgrowth (8) 41)A E Housman wrote about this one in 'A Shropshire Lad' in 1897 (6) 48)You will need these to make silk (8)
if anyone could help with no's
50) She married Captain James upstairs (5)
45) five lined poem popularised by Edward Lear (4)
40) General Sherman and general Grant are these (5,7)
17) originally a worker in lead (4)
13) Swallow without a point (6)