356 Commonwealth Avenue, Boston, lass., Feb. 3, 1922. 
My dear £r. Powell: 
The genus covers for your specimens 
were sta.rpod today and look very well. On the lower left 
hand corner appears the generic name and genua number; on 
Herb. Powell 
the right hand corner appears the following: 
Panama. 
Shore are twenty-two genera to date, flow it will be of 
great interest to sea the covers fill up. Phis reminds me 
that you use a separate cover for each species. I allow 
about ten sheets to a genus cover. Another things to guard 
against is mounting your specimens so that the bulky parts 
always come in ths same place. At present you need to get 
more oulk near the top and on the right hand side of the 
sheets. Of ©ours© this is not always easy to do, hut bear 
the matter in mind. 
I am afraid Ple uroth allia panaaenais 
is too close to P* pergraoills Koife. It is also very 
near P. c hocon !ana fats. 1 worked up these species pretty 
a 
carefully at Kew and have Holfe’s oame^-luaida sketches 
that he made when I was with him in 1905. P. marginsta 
Lindl. is also close, differing chiefly from the others 
in having the lateral sepals almost free. 
Yours faithfully. 
