THE CORRESPONDENCE OF SCHWEINiTZ AND TORREY 147 
Sprengel’s laetitia. I had not observed this texture before, & had 
indeed not conceived the frons to be an integral part of the 
specimen—I thought it was the substance on which the pre- 
sumptive fungus grew. But I am convinced it really is the 
Blandowia. No fungus has any similar texture, & there can be no 
doubt of this frons belonging to the plant, because that texture 
is perceptible even in the lower part of the fructification. 
Iam very sorry you could not name all the Crypt. you have 
sent me—because your names would have undoubtedly been 
servicable. I must beg you to consider in my determinations of 
all but the Fungi (in which I pretend to some knowledge) that I 
cannot be any considerable authority except where I am borne out 
by my European specimens—as it is only of late that I have 
applied myself closely to the study. Don't suffer yourself how- 
ever to be discouraged—exertion & communication will after a 
while enable us to be more confident than at present can be the 
case. 
I beg you to excuse my scrawl & to let me hear from you 
again as soon as possible, especially concerning the Phaenog. 
plants I sent you and remain with high respect 
Your most obdt Servt 
Lewis D v SCHWEINITZ 
I should be extremely obliged to you for the whole title of the 
Species algarum—by Agardh (3]—together with a mention of the 
price of the work. If you have any means of procuring me a copy 
I would thank you—& with pleasure refund all expenses. I have 
this spring succeeded in determining about 40 kinds or spec. of fresh 
water algae all of whom except two or three are absolutely the 
same with the European Species. 
TORREY TO SCHWEINITZ 
New York Oct. 8th 1821. 
Dear Sir 
It is now near six months since I had the pleasure of receiving 
a letter from you, except I must consider as such the single line 
in the envelope of your Hepaticae. Indeed I can hardly blame 
you when there was so much apparent reason for thinking I 
had not used you well. You may depend I was exceedingly 
