The North American Slime-Moulds: A Descriptive List of All Species of Myxomycetes Hitherto Reported from the Continent of North America, with Notes on Some Extra-Limital SpeciesMacbride, Thomas H. (Thomas Huston)
Science
The North American Slime-Moulds: A Descriptive List of All Species of Myxomycetes Hitherto Reported from the Continent of North America, with Notes on Some Extra-Limital Species
Macbride, Thomas H. (Thomas Huston)
Myxomycetes
"The size indeed, the circumscribed form, the capillitiums conjoined
into a single body--indue this (form) with an appearance peculiar to a
degree; however, should anyone prefer to call it a very remarkable
variety of the preceding (_S. fasciculata_), we shall not strenuously
refuse. At first glance it looks like a tubulina. After the fashion of
its kind, the beginning is soft and milky. The diameter generally an
inch and a half to two inches, the height four to six lines; the form
perfectly round, or more rarely somewhat oblong. The hypothallus, stout,
pellucid silvery, betimes iridescent, when turned to the light, easily
separable from the substratum, bears the columellae, dusky, thin,
hair-like, aggregate and yet entirely free, and everywhere circinately
convergent, depressed by the superimposed burden, hence decumbent: ...
the capillitium loosely interwoven, coalesces to a common mass whose
smooth and shining surface shows above, regularly disposed minute
papillae, the apices of individual sporangia.
"Far from infrequent, on decorticate pine, of _Lycogala atrum_ a
constant companion"!
It goes of course without saying, that for the authors quoted, _Lycogala
atrum_ is _Amaurochaete atra_ Rost. _A. fuliginosa_ (Sow.) of more
recent students, described and perfectly figured in the volume cited.
It is surprising that they did not enter the present species also as a
lycogala. But the stemonitis relationship this time impressed them
rather than the aethalial; besides they were misled by the _S.
fasciculata_ of Gmelin and Persoon, a composite which the genius of
Fries hardly availed to disentangle twenty-five years later.
The last named author, as we see, wrote first _Lachnobolus_, then
_Reticularia_. He calls the interwoven capillitium--_lachne_, wool, a
"_pilam tactu eximie elasticam_," etc. He read the description in the
_Conspectus_, but carried away the stemonitis suggestion dominant there,
as we have seen, put _S. tubulina_ A. & S. as an undeveloped phase of
_S. fusca_, which, of course, it is not. It needed not the authority of
Rostafinski, _Mon._, p. 197, to assure us this. The earlier authors
describe the species in course of development to complete maturity, and
clinch the story by declaring the form a constant companion of the
commonly recognized amaurochete, so fixing the relationship for us by
habitat also.
These men made a mistake, of course, in placing their species among the
stemonites at all. They did much better however than Fries who called it
a reticularia. It was also a mistake to cite _S. fasciculata_,--the
small fasciculate tufts of _S. fusca_ and _S. axifera_ offering by the
aggregate habit only faint resemblance,--a possible refuge for those who
would prefer another disposition of their species distinct (_aliena_)
though it is.
Public-domain text, read in full here on John Shaqi.
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