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Page number:278 
Remarks (public):This taxon has been interpreted as merulioid, and combinations in the genera Caloporus Karst. and its later synonym Meruliopsis Bond. $ Sing. ex Parm.were made by Ryvarden (1973:9) and Parmasto (1968:103), respectively. Its close microscopical resemblance to Caloporus taxicola (Pers.:Fr.) Ryv. was additional reason for including it in those genera. Ceriporia spissa has better developed tubes and a polyporoid macromorphology (tubes up to 2.5-(5.0) mm long.) with 4.S-6 pores per mm; microscopically the hyphae, 2.1-5.2 µm wide, their parallel and compact arrangements in the dissepiments gives in transverse section a pseudoparenchymatous appearance
which is absent in Caloporus taxicola. The extracellular matter in C. taxicola is chestnut reddish, giving the hymenophore a purplish colour upon drying. C. taxicota has a poorer tube development (only up to 1 mm long), and slightly larger pores (3-5 per mm); microscopically the hyphae are wider in average (3.1-7.2 µm) and are irregular and loosely arranged in the dissepiments, and the extracellular matter is smoky chestnut and gives the hymenophore a darker, almost vinaceous, tint upon drying. Lowe (1966:36) has also pointed out differences in substratun preferences, which we could not confirm. In spite of all these differences, spore shape and size are similar in both species. The principal anatomical character that separates Ceriporia spissa from Caloporus taxicola and which excludes the former from the genus Caloporus is the continuous hymenium over the folds found in the latter whereas sterile edges of dissepiments are found in C. spissa. Cultural characters of Ceriporia spissa support the exclusion of it from the merulioid genera and its inclusion in Ceriporia Donk.
Ceriporia species only develop simple septate generative hyphae in culture, with or without coloured crystals or contents that colour the mats, and in some species sclerified generative hyphae are found . Though all Ceriporia species are associated with a white rot they show a variable oxidase reaction in culture (as shown in Table I) that varies from negative, to weakly positive to distinctly positive. Kirk & Kelman (fide Ginns, 1976:153) "have attributed the lack of a reaction on the media to the lack of an inducer in the agar to trigger the production of oxidase. The possibility exists that this species and the others of Meruliopsis possess a different biochemical pathway, from that of the typical 'white rot' species, in causing a white rot". This might perhaps be the same case in other species of Ceriporia. If confirmed, an evolutionary relationship could be established between Caloporus Karst. and Ceriporia Donk, as indicated by Jülich and Stalpers (1980:16) and C. spissa could well be a bridge between both genera.
Description type:Culture description 
Description:CERIPORIA SPISSA (Schw. ex Fr.) comb. nov. (Figs. 5-8, 47)
Basionym: Polyporus spissus Schw. ex Fr., Elench. Fung. p. 111, 1828.
CULTURE STUDIED: n°471: Argentina, Buenos Aires, Monte, Z. V. Dorna, leg. J. Deschamps BA-1724, 9.IV.72 =BAFC 27932.
GROWTH CHARACTERS: growth very slow, 2 cm/7 days, 3.8 cm/14 days, 5 cm/21 days, covering the plates at the end of the 6th week of study. Margin regular, hyaline and subfelty. Mats cream, becoming pink (Cupid Pink 1 E 8), subfelty in the advancing zone, felty towards the inoculum (Fig. 47). Odor strongly musty to somewhat fermented. Reverse unchanged. Oxidase reaction in GAA: - , 0 ; in TAA: - , 0 ; in TyA. - , 0 ; in pCA: - , 15 ; with GG: -
MICROSCOPIC CHARACTERS: Advancing mycelium formed by simple septate, thin to slightly thick-walled generative hyphae, branched, 2..6-6.2 µm wide, with constrictions (Fig.5). Felty mat formed by similar generative hyphae, more branched, 1.6-7.8 µm wide, thin-walled or with walls thickened up to 1.0 µm (Fig. 6); amorphous yellowish crystal deposits (a resin?) are found on thesehyphae, free in the agar (Fig.7) or inside sclerified generative hyphae (see below). Inoculum and submerged mycelium have similar generative hyphae plus simple septate, branched and sclerified generative hyphae, 5.2-7.8 µm wide, with walls up to 2.6 µm thick (Fig. 8). Fruitbodies did not develop in the plates but appeared erratically in tube slants as orange-yellowish spots. Their basidia are cylindric to clavate, tetraspored, 13.0-18.0 x 4.2-5.2 µm; basidiospores allantoid, 4.2-4.7 x 1.0-1.5 µm. Irregular yellowish crystals heavily incrust the hyphae and basidia, originating the macroscopic coloration.
SPECIES CODE: 1. 6. 7. 32. 37. 38. 46. 53. 54.
REMARKS: Ginns (1976:102) established that multiclamped (verticillate) hyphae are typical in the advancing zones in cultures of Caloporus species (code n° 5, fide Nobles, 1965: 1103). This character was not found in our culture of Ceriporia spissa.

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