OHONDBIODERMA.J PHTSAEACE^. 79 



Ghondrioderma Cuhense Rost., Mon., App., p. 19. Ghondrioderma 

 difforme Mass., Mon., p. 213 (in part). Diderma Ma/rice-Wilsoni 

 Peck, in Rep. N. York Mus. Nat. Hist., xxvi., p. 74. 



Plate XXX., B.— a. Sporangia, x 20 ; b. capillitium, with fragment of 

 sporangium-wall, and spores, x 280 ; e. spore, x 600 (Poland, Eostafinski's 

 type). 



The type specimen of Diderma sublateritium Berk. & Br., from 

 Ceylon (K. 1454), is more rufous in colour than is usual in G. testaceum, 

 though not so deep in tone as the specimen from S. Carolina 

 (B. M. 520) ; the capillitium and spores are typical of this species, of 

 which it is clearly a form. 



Hab- On dead leaves.— Flitwick, Beds. (L:B.M.55) ; Moffat, Scot- 

 land (L:B.M.55) ; France (B. M. 517) ; Germany (B.M. 516) ; Poland 

 (Strassb. Herb.); Ceylon (L:B.M.55) ; New York (L:B.M.55) ; Ohio 

 (L;B.M.55) ; S. Carolina (B. M. 520) ; Cuba (L:B.M.55). 



5. C. Michelii Rost., in Fuckel, Bymh. Myc, Nachtr. 2, p. 74 

 (1873). Plasmodium opaque white. Sporangia flat, disc-shaped 

 on a central stalk, rarely sessile on a broad base and confluent, 

 chalk-white, 1 to 1 "25 mm. wide ; sporangium-wall of two layers on 

 the flat upper surface, the outer a fragile smooth crust composed 

 of globular lime-granules 1 to 3 ;«, diam., separating from the more 

 persistent membranous inner layer ; under surface rugose. Stalk 

 pale ochraceous, 0"5 mm. long, 0'25 mm. thick, furrowed with 

 wrinkles, which are continued over the flat under side of the 

 sporangium ; densely calcareous. Columella indefinite, consisting 

 of the broad thickened base of the sporangium, flesh-red or 

 flesh-brown, charged with calcareous deposits in the form of 

 nodules and large rhomboidal granules. Capillitium of colourless 

 delicate threads, variously branched and anastomosing, or of 

 violet-brown threads 1 to 2 /x thick, sparingly branched except at 

 the pale extremities. Spores pale violet -brown, almost smooth, 

 7 to 9 j«, diam.— Mon., p. 172, figs. 131, 146, 149, 150. Cooke, 

 Myx. Brit., p. 37 ; Mass., Mon., p. 204. Didymium Michelii Lib., 

 PI. Ardu. Exsic, Fasc. ii.. No. 180. Physarwm depressum Schum., 

 Enum. PI. Saell., ii., p. 202 (1803). Diderma depressum Fr., Syst. 

 Myc, iii., p. 108 (?). 



Plate XXXI., A. — a. sporangia, x 20 ; J. capillitium, with fragment of 

 sporangium-wall and spores, x 280 ; o. capillitium.^ with stouter and more 

 rigid threads, x 280 ; d. rhomboidal nodules of lime from stalk, x 280 ; 

 e. spore, x 600 (England). 



Hab. On dead leaves, etc. Common. — Lyme Regis, Dorset 

 (L:B.M.56) ; Batheaston, Somerset (B. M. 47) ; Boynton, Yorkshire 

 (B. M. 1112) ; France (Paris Herb.) ; Belgium (B. M. 513) ; 

 G-ermany (Strassb. Herb.) ; Sweden (K. 1449) ; Ceylon (K. 1440) ; 

 8. Carolina (B. M. 890) ; Pennsylvania (L:B.M.56). 



6. C. reticulatumRost., Hon., p. 170 (1875). Plasmodium? 

 Sporangia rounded, much depressed, sessile, gregarious, 0*7 mm. 

 diam., or more usually elongated and forming flat branching or net- 

 like plasmodiocarps, smooth, white ; sporangium- wall of two layers, 

 the outer a fragile crust of globular lime-granules, separating 



