 Inocybe alnea and I. ochracea , regarded by some as the same species , can also be distinguished from I. saliceticola by the presence of protruding nodules on the spores . DNA analysis confirmed that they were separate from I. saliceticola , and , in any case , it is possible that they do not grow in association with willow . I. hirculus has been recorded growing near I. saliceticola , but can be differentiated both macroscopically and microscopically ; the mushrooms of I. hirculus have a much more fibrillose cap , and the stem does not join a bulb , while the spores are larger . Macroscopically , I. rivularis , which could grow in similar habitats to that of I. saliceticola , produces larger mushrooms and has powder only towards the top of the stem . It also differs microscopically . 
