132 NOTES ON POTAMOGETONS. 
as to whether they belong to Leann or Gyromitra, and, secondly, 
whether they are both the same species, that I will not on the 
occasion offer any acaba: on the subject, but may return to it 
again hereafter. 
Finally, one word of thanks to Mrs. Coker Beck for taking the 
trouble to make a long journey to obtain additional specimens 
when the first were damaged in transit; to Dr. Cooke, for informa- 
tion respecting specimens in the Kew ‘Herbarium ; and to Mr. G. 
urray, for the like fayour with regard to the British cnet 
N oF Prate 334.—Fig. 1. A young specimen of Gyromitra ee 
(Kvombh.) )s showing the typical gyrose structure of the hymenium, nat. s 
A section of the same, showing the cavi week of the sui sod of She @ pleas, 
a like ea of the exterior, are clothed with the hymenium. older 
sessile specimen, to illustrate o ae of the any Socie ee specie ae 
4. Ascus and paraphyses, x 400. 5. Sporidia, x 400. 6. Cells of the pseudo- 
parenchyma, x 400. 
NOTES ON POTAMOGETONS. 
By Arruur Bennert, F.L.S. 
(Continued from Journ. Bot. 1892, p. 230.) 
In trying to get together ees respecting this genus, 
there are still several forms abou ich no satisfactory facts can 
be ascertained, and * is difficult et sian whether there are 
specimens of these in any herbaria. I shall be grateful for the 
slightest hint peleeind to any of these, especially for the loan of 
specimens. 
Poramocreton GavupiIcHAUDIT nem? f in Linnea, i li. 199 (1827), 
(‘In rivulo dulcis aque urbem Agaiia in insula Guajan percurrente 
legit amicissimus Gaudichaud’’) is one of these.—Chamisso often 
intimates in what herbaria he has seen his plants, but here he 
gives no clue, and there are no specimens at Berlin ee Dr. 
: he ist. 
i, 588 (1869), reproduced in this Journal for 1869, p. 179, Hoe. 
Mann names P. Gaudichaudii Cham. as found in the Hawaiian 
Islands, but whether from description, or seeing original examples, 
I know not.* Of the other pons described by Chamisso, Ses have 
seen original examples of all, except P. Nuttalii and P. americanus. 
I have not succeeded in Si teasinn where the specimens thes on which 
these aee founded. 
of the description of P. Gaudichaudii has induced 
the belief that this may really be conspecific with P. mucronatus 
ee le trp preter eS ache 
seems to have included it in his list under the mistaken notio 
that ocality was in the uae h Islands. Hillebrand (F1. Deoaiian 
Inada . 459) says : — H Man gyi RS P. Gaudichaudii Cham., 
which is referred to P. lucens by Kunt h (Enum. iii. 131), but a reference to his 
quotation (Linnea, ii. 199) shows hat Sendiehend’s plant was collected on the 
island of Guam or Guajan of the Ladrones,”—Ep. Journ. Bor T. | 
