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CYLINDROSPORUM c o n c e n t r ic u m .
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Concentric Cylindrospore.
C la ss a n d O r d e r CRYPTOGAMIA FUNGI, & W _ N a t . O r d . FU S ID OW EÆ , Grev.
—EPIPHYTÆ, Link.
GEN ERIC CHARACTER.
Plantee mwmtisàmoe in foliis vivis parasiticce, non rupta epidermide. Sporidia
cylindrica, truncata, non septata, nuda, libera, coacérvala.
Very minute plants, parasitic on living leaves, without rupturing the epidermis.
Sporidia cylindrical, truncate, jointless, naked, free, forming little
heaps.
S P E C IF IC C H A R A C T E R .
C vL iN D R o sp oRUM c o n c e n t i 'i c u m .
CVLINDROSPORUM c o n c e n t r i c u m , Grev. Fl. Fdin. ined.
H a b . On both surfaces o f Cabbage leaves {Brassica oleráceo,). Balmuto,
Miss B o s w e l l . Garden o f A l e x a n d e r S m i t h , Esq. Parson’s Green!
May and June. Also at Foxhall, in September.
Very white, and excessively minute, but sufficiently conspicuous from their
number, and from being disposed in concentric lines. Form most irregular;
frequently oblong, lying in the direction from the centre to the
circumference, projecting into angles and little eminences, and having
often one extremity turned up like the end of a canoe. Sporidia very
numerous, cylindrical, truncate at both extremities, pellucid, without
joints, and not furnished with any membrane or covering whatever.
Turning in decay to a dirty yellow, which always commences in the
centre, while new individuals are forming at the circumference.
A very extraordinary plant, first observed by Miss Bosw
e l l . It does not seem to be very rare, as I bave noticed it
in various localities since,« and probably few gardens will be
found witbout it at some time or otber of tbe year.