GENERAL CLASSIFICATION OP MYXOMYCETES.
GROUP XII.—MYXOMYCETES, WALLR.
A r r a n g e m e n t o f O r d e r s (9 ) .
A .— Wall o f spore sac not encrusted w ith lime—
Section 1. Peritricîiæ—Capillitium absent or formed from wall of spore sac.
6 1 . T o b d l in a c e æ — W a l l o f s p o r e s a c n o t p e r f o r a te d .
62. C r ib r a r ia c e æ —Wall of spore sac perforated.
Section 2. Columelliferæ—Capillitium originating from central columella.
63. S t e m o n it a c e æ—Arising from every part of elongated columella.
64. L a m r r o d e r m a c eæ—Arisiug from apical portion of columella.
Section 3. Calotricheæ—Capillitium not springing from columella.
65. A r c y r ia c e æ—Threads attached.
66. T k ic h ia c e æ—Threads free.
E. Wall o f spore sac with external deposit o f lime—
Section 4. Lithodermeæ—Capillitium present.
67. D i d y m i a c e æ — Threads without lime.
6 8 . P h y s a r a c e æ — T h r e a d s w i t h lim e .
C.— Without special spore sac.
69. P l a s m o d i o p h o r a c e ^ — Plasmodia, or naked motile masses of protoplasm, formed.
O r d e r L X I .— T u b u l in a c e æ , M a s s .
Genus (1)—
401. Tuhuliua, Pers.
O r d e r L X I I .— C r ib r a r ia c e æ , M a s s .
Genera (2)—
402. Enteridium, Ehrh.
403. Clathroptychium, Rost.
O r d e r L X I I I .— S t e m o n it a c e æ , R o s t .
Genus (1)—
404. Stemonitis, Glcd.
O r d e r L X I V .— L a m p r o d e r m a c e æ , M a s s .
Genus (1 )—
405. Lamproderma, Rost.
O r d e r LXV.—A r c y r ia c e æ , R o s t .
Genera (4)—
406. Perichoena, Fries.
407. Lycogala, Pers.
408. Prototrichia, Rost.
409. Arcyria, Hill.
O r d e r LX VI.— T u ic h ia c e jE, R o s t .
Genus (1)—
410. Trichia, Hall.
O r d e r L X V II.—D i d y m i a c e a ì , R o s t .
Genera (4)—
411. Cbondrioderma, Rost.
412. Didymium, Schrad.
413. Spumaria, Pers.
414. Diachma, Fries.
O r d e r L X V I II .—P h y s a r a c e a ì , R o s t .
Genera (6)—
415. Craterium, Trent.
416. Physarura, Pers.
417. Badhamia, Berk.
418. Tilmadoche, Fries.
419. Leocarpus, Link.
420. Fuligo, Hall.
O r d e r LX IX .—P l a s m o d i o p i i o r a c e a c , Z o p f .
Genus (1)—
421. Plasmodiophora, Zopf.
I