Sorry about that ... it is Mephisto 2732 and 15d Fish boxes with a bit of paper poet's covered in flowers (8) -owsl-p-; 33a Dead tree's blotch (4) s-sh; 16d one of three rarely, rarely put up rolls -rind-e- (8) and 25d Thursday includes a tedious course; it could be gospel (5) truth
Factor 30 - I didn't know "cowslip'd" either, but I found it Sunday last when doing the Meph. These poets sometimes emasculate the language to make things scan!