September 15 th, 1920. 
My bear Dr. Sch 4 . 0 ch.ter: 
Your letter of July 2a reached me in 
good season, out as I was avay on my summer vacation X could 
not give it the attention it deserved and so postponed an ans¬ 
wer until this a ay. The manuscript of Srobya o ante through ail 
right and I have examined it as a typo of the treatment we are 
to adopt throughout our joint work. I thing; the simplicity of 
the arrangement will make our task quite easy and enable us to 
publish a geodly number of species onee we begin to get into our 
stride. If you will let me know what you think will be the best 
plan so far as actual publication is concerned I will go ahead 
with the details. Perhaps one of our large presses would handle 
tin work if a gurantee were to be given that no las should be 
suffered, 
I have in mind, for my first contribution the following: 
Isotria(if that is a valid monotypic genus). Arethusa and allied 
genera (the Bletillinae), dpirqnthos and Goody-ora. I find that 
I have a pretty good beginning for Goodyera as Xaton and I work- 
on the group Before hie death. This summer X have been studying 
Spiranthes In the field and 1 have given the species vary careful 
attention. 1 found the other day near my house a veil marked 
oer nna - graoills hybrid. Just at present I am getting together 
mater 1 hXT or s'” sevonth volume of my Grchidaoeae and I intend to 
illustrate and describe our native species of exceptional in¬ 
terest. This summer I studied carefully pogonla trianthophora . 
I have a colored sketch of the plant that Irs. Ames made many 
years ago for a book that never was published. I am sending you 
one of a few proofs that were taken from the sketch. This will 
be welcome* to you for your herbarium. X am else sending you a 
flower in formalin-alcohol so that you msy examine the parts 
in perfect condition. You. will notice th- t the pollinia are 
very much like those of Aretbusa end not at all like the pollin¬ 
ia of th-? other PogorJes. The rigid attachment of the anther is 
very different from other pogonias. The pollen itself is reticu¬ 
lated, faintly, a characteristic that I have not notea in other 
Pogonias. Pogonia ophioglassoidee does not have pollen tetrads 
at an thesis as do the other species referred to the genus. This 
peculiarity it seems to rae would warrant . . still more rigid 
segregation of species than has heretofore bear; attempted. It 
would seem that P. divaricata , if excluded from association with 
f. pertioillata, would become a distinct, monotypic genus. The 
reason for removing it from the P. opioglossoid.es category would 
be based on its having perfect tetrads of pollen. Aside from the 
unjointed leaves of ?. trianthophora how do you keep the species 
out of the Bletillinae? That is, how do you keep ?. trianthophora 
out of the Bletillinae? After your examination of the matrial I 
am sending to you to-day please let me have your opinion of my 
observations. 
