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Page number:156 
Remarks (public):Dr. M. A. Donk, in this connection, drew my attention to what seemed to be a similar kind of spores, viz. the "Gastérospores", which were stated by Heim & Malençon (1928: 6g, fig. 5) to occur in the dissepiments of Ganoderma rivulosum Pat. & Har. ' However, whereas these spores apparently developed in the living tissue of the fruit-body, the strange fact remains that the subglobose spores in Hydnum boveanum were produced after the specimen had been filed in the herbarium. Another difference is that these spores were not found to occur in the trama of the spines, which is homologous to the tissue of the dissepiments of a polyporous fungus. These considerations raise the question whether the spores under discussion belong to the species at all.
The hyphal structure of Hydnum boveanum, as far as can be made out, agrees with that of Hydnum henningsii, the type species of the genus Gyrodontium, while the basidiospores are exactly alike in size, shape, colour, and possession of a small, oblique apiculus. There can be no doubt, therefore, that the present species and H. henningsii are congeneric, but it seems advisable not to conclude yet that both are conspecific until better preserved material is available. Accordingly, the following recombination is here proposed: Gyrodontium boveanum (Mont. apud Dccaisne) Maas G., comb. nov. (basionym, Hydnum boveanum Mont. apud Decaisne, l.c.).
 
Description type:Non-original description 
Description:Hydnum boveanum Mont. apud Decaisne in Ann. Sci. nat. (Bot.), Ser. 2, 4: IN.. 1835; Mont. apud Fr., Epicr. Syst. mycol. 513. 1838; Mont., Syll. Gen. Spec. Crypt. 173. 1856. - Type: "Hydnum boveanum Montag. / Sur des poutres Bans le palais d'Ibrahim au Cairc / Corn. Cl. Bose" (PC).
A thin membrane bearing a mass of crowded spines is all that is left of the fungus described by Montagne. Where one would expect to find the fruit-body proper, the context is completely replaced by a thick layer of compacted fulvous powder. Spines up to 7 mm long, 0.3-0.4 mm thick, subulate, collapsed (probably from old age), and flattened and sulcate. Hyphae of the trama of the spines for the greater part badly collapsed, but in places still recognizable: of one kind only, up to 6.3 µm wide, thin-walled, septate, without clamp-connections, branched and with occasional connecting hyphae. Basidia collapsed. Spores (Fig. 3) ellipsoid, adaxially flattened, smooth, yellow-brown under the microscope, rather thick-walled, 3.8-5.4 x 2.7-3.6 µm, with small, oblique apiculus. Cystidia and gloecystidia not seen.
The compact powdery layer mentioned above is made up of broadly ellipsoid to subglobose spores (Fig. 4), 3.6-4.9 x 3.1-4.5 µm, yellow-brown and moderately thick-walled (the smaller ones) to dark brown and thick-walled (many of the larger ones), often with what seems to be a median, colourless, often very prominent apiculus, but occasionally without such a structure.
While there is no reason to believe that the specimen examined should be anything else than Bove's material (for those parts of Montagne's description that can be checked agree very well), it is difficult to imagine by what agent the pileus, after Montagne had described it, was completely destroyed and reduced to a powdery mass without there being left any trace of the original tissue. The symmetric shape of the spores, the median position of the apiculus (if it is an apiculus), the variable size of the latter, and its occasional absence suggest that the spores might be conidiospores or chlamydospores.
 
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