. The North American slime-moulds [microform] : being a list of all species of Myxomycetes hitherto described from North America. Myxomycetes; Myxomycètes. 84 THE NORTH AMERICAN SLIME-MOULDS ing the plasmodium ascends preferably living stems of small bushes, herbaceous plants, or grasses, and forms the :cthalium around the stem some distance above the ground. The cortex varies in amount, is also deciduous, so that weathered or im])er- fectly developed forms probably represent the var. conuita^ S. cornuta 2. Didymium {Schmd) Fr. 1797. Didyniiuvi Schrad., A'ov. Gen. I'ltiiit., p. 20 (in
. The North American slime-moulds [microform] : being a list of all species of Myxomycetes hitherto described from North America. Myxomycetes; Myxomycètes. 84 THE NORTH AMERICAN SLIME-MOULDS ing the plasmodium ascends preferably living stems of small bushes, herbaceous plants, or grasses, and forms the :cthalium around the stem some distance above the ground. The cortex varies in amount, is also deciduous, so that weathered or im])er- fectly developed forms probably represent the var. conuita^ S. cornuta 2. Didymium {Schmd) Fr. 1797. Didyniiuvi Schrad., A'ov. Gen. I'ltiiit., p. 20 (in part). 1829. Didyiniiiiii (Schrad.) Fries, . Myc, III., p. 113. 1875. Didyiniiiin (Schrad.) DcDy., Rost., I'crsiic/i, p. 13. Sporangia distinct, stipitate, sessile or even plasmodio- carpous, never xthalioid ; the peridium thin, irregular in dehis- cence, covered with a more or less dense coating of calcareous crystals; columella more frequently present; capillitium of delicate threads, simple or sparingly branched, extending from the columella to the pvâridial wall. The genus Didymhun, as set up by Schrader , included a number of species now assigned to Didcrnia. For the present limitations we are indebted to Fries and DeBary. The genus is among Myxomycetes instantly recognized by the peculiar form of its calcareous deposits, stellate crystals frosting usually distinct sporangia. â | i; I. D. complanatum 2. D. arelliis Key to the Species of Didymium. A. Fructification plasmodiocarpous. a. CapilHtiuni with adherent vesicles b. Capillitium .simple 23. Fructification normally distinct. a. Sporangia sessile or nearly so; outer calcareous wall conspicuously developed . . . 3. Z^. crtistaccum b. Sporangia plainly stipitate. i. Peridium much depressed; umbilicate below. * Stipe white 4. Z?. squaviulosum ** Stipe black. f Small, about .5 mm 6. Z7. minus ft Larger, about .75-1 mm. 5. Z?. tnclanospcrmiiin ftt Sporangia discoid "]. D. clavtis. Please note that these i
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