- 92 - 
“There is considerable discrepancy between Tuckerman's descrip- 
tion of E. solida and Bornet’s original description. Your material 
agrees superficially with Tuckerman’s description, but Bornet says 
‘Les filaments sont assez gros, peu ramifies.’ (your material is 
much branched) then ‘les cellules de leur partie interieure sont de 
deux sortes : les unes sont etroites, flexueuses et rayonnantes ; les 
autres, tres grandes, arrondies, ressemblent, sur une coupe transver- 
sale, a I’ouverture de gros vaisseaux.’ I have cut sections of your 
material and the cells do not correspond to this description. I find 
that the filaments of the Siigonema are intertangled with fungus fila- 
ments which are. however, external and not growing through the alga 
as should be the case in an Ephebe. Further the alga is evidently not 
in good condition. It was undoubtedly these fungus filaments which 
Dr. Richards saw when he reported to you that such filaments were 
present. The conclusiDn which I have reached after studying your 
material and comparing it with specimens of Ephebe pubescens and 
E. mamillosum in our herbarium, is that your specimens are Stigonema, 
rather degenerate and parasitized by some hyphomycetous fungus.” 
I regret very much that this erroneous record should have stood 
in print for nearly five years, as I realize very keenly how misleading 
such published data are, and moreover how common such false records 
are in our North American lichenological literature. In this case I 
have no excuses to offer, and assume the entire responsibility. 
Thoreau Museum, Concord, Massachusetts. 
EXCHANGE DEPARTMENT. 
(To Society members only. Be sure to send a stamped, self-addressed envelope.) 
Dr. John W. Bailey, 4541 14th Ave. N. E., Seattle, Wash. — 
Dichelyma uncinatum var. cylindricarpum Card. 
Rev. James Hansen, St. Johns University, Collegeville, Minn. — 
Amblystegium riparium B. & S. 
H. S. Jewett, M. D., 15 W. Monument Ave., Dayton, Ohio. — 
Brachythecium cyrtophyllum Kindb. Mnium cuspidatum (L.) Leyss., 
from the vicinity of Dayton. Grimmia Doniana Sm. Swart zia montan a 
(Lamk.) Lindb., from Colorado. 
Prof. A. S. Foster, Pacific Beach, Chevalis Co., Wash. — Ptery- 
gophyllum lucens (L.) Brid. Ulota phyllantha Brid. 
Mrs, Elizabeth M. Dunham, 324 Center St., Auburndale, Mass. — 
Anomodon attenuatus (Schreb.) Hueben. Leucodon brachypus Brid. 
W. W. Calkins, Berwyn, Illinois. — Amblystegium Juratzkanum 
Schimp. Orthotrichum strangulatum Sulliv. 
