Rare bulbs may be wrapped singly in tissue paper for storing.
In Dictyota the oospheres arise singly in oogonia, crowded together in sori on the surface of the female plant.
The male sexual cells are produced singly in the terminal cells of branches.
In the Novum Organum, after giving a long list of the sources of heat, he says: "From these examples, taken collectively as well as singly, the nature whose limit is heat appears to be motion..
The tentacles may be scattered singly round the margin of the umbrella (" monerenematous ") or arranged in tufts (" lophonematous "); in form they may be simple or branched (Cladonemid type); in structure they may be hollow (" coelomerinthous "); or solid (" pycnomerinthous ").