lender threads, extending from base to upper surface, much branched,
the branches combined into a dense network; to these threads adhere
numerous roundish vesicles, composed of a brownish membrane, inclosing a
yellow coloring matter, the vesicles 30-50 mic. in diameter. Spores
globose, very minutely warted, violaceous, 7-8 mic. in diameter.

Growing on old leaves, bark, etc. The plasmodiocarp .6-.8 mm. in
thickness and extending from one to several millimeters in length. This
species is reported from the United States by Massee. It ought to be
readily recognized by its yellow plasmodium and the peculiar vesicles
adherent to the capillitium.

11. DIDYMIUM ANELLUS, Morgan, n. sp. Plasmodiocarp in small rings or
links, then confluent and elongated, irregularly connected together,
bent and flexuous, resting on a thin venulose hypothallus; the wall
firm, dark-colored, with a thin layer of stellate crystals of lime,
irregularly ruptured. Columella merely a thin layer of brown scales.
Capillitium of slender dark-colored threads, which extend from base to
wall, more or less branched, and combined into a loose net. Spores
globose, very minutely warted, violaceous, 8-9 mic. in diameter. Plate
XII, Fig. 41.

Growing on old leaves in woods in Spring. Plasmodiocarp in rings .3-.5
mm. in diameter, or often more or less elongated into links and chains,
which are bent and flexed in quite an irregular manner, the thread or
vein composing them about .2 mm. in thickness. A more minute species
than _Didymium serpula_, without characteristic thickenings upon the
threads of the capillitium, and wanting the peculiar large cells of this
species.

II. SPUMARIA, Pers. AEthalium composed of numerous elongated,
irregularly-branched sporangia, more or less closely compacted together
and confluent, seated upon a well-developed common hypothallus; the
walls of the sporangia a thin membrane with an outer layer of minute,
stellate crystals of lime. Each sporangium traversed by a central
subcylindric hollow columella, which extends also to the branches, but
does not reach to their apices. Capillitium of slender threads, more or
less branched, and combined into a network. Spores globose, violaceous.

Spumaria is essentially related to Didymium by the crystals of lime upon
the walls of the sporangia. Rostafinski's figure 158 can only be
regarded as ideal or diagrammatic. I am disposed to question the
existence of the central columella altogether; i