Macbrideola rutilipedata (H. Marx) G. Moreno, Seraoui, Mar. Mey. & López-Vill. 2023

Moreno, G., Seraoui, El-Hacène, Meyer, M. & López-Villalba, Á., 2023, A new species of Macbrideola on galls of Rosaceae, Phytotaxa 613 (2), pp. 180-186 : 183-184

Macbrideola rutilipedata (H. Marx) G. Moreno, Seraoui, Mar. Mey. & López-Vill. , comb. nov. Fig. 3

MycoBank: MB847119

≡ Comatricha rutilipedata H. Marx , Boletus 23(1): 33 (1999)

Material studied: GERMANY: Strausberg , NSG Lange Dammwiesen und Unteres Annatal, MTB 3449/3, ca. 35 m NN, cult. Auf weblichen Kätzchen von Alnus glutinosa . 11.03.- 31.03.1995, H . Marx , B700100374 holotype . LITHUANIA: Varéna distr. , Puvočiai environs, right bank of Merkys river, Alnus glutinosa cone, mc., 12-07-2001, G . Adamonyte , duplicate ex herbarium Instituti Botanici Lithuaniae 901 in AH .

Remarks: The macro- and microscopic (LM) description of this species was already carried out by Marx (1999). Additionally, we provide in this work a SEM study of the capillitium, stalk, and ornamentation of the spores, characters that differ from those described for Macbrideola gallicola sp. nov. We have compared the type specimen of Comatricha rutilipedata with Lithuanian material that also fructified on cones of Alnus glutinosa ( Fig. 4 ). With this, we seek to confirm the constancy of the morphological characters and to be able to compare them with the new Macbrideola described herein.

KEY TO MACBRIDEOLA SPECIES WITH SPINY SPORES

1. Sporotheca globose to subglobose, spores 8–9 µm in diam., foliicolous................................................... Macbrideola spinosispora

1’. Sporotheca cylindrical to ovoid..........................................................................................................................................................2

2. Spores spiny, spines thickened at the base and smooth at the apex, capillitium rigid and dark with parallel main branches emerging along the columella........................................................................................................................................... Macbrideola herrerae

2’. Spores spiny, spines not thickened at the base and ornamented at the apex (only visible under SEM), capillitium sinuous and pale brown..................................................................................................................................................................................................3

3. Spines with denticulate ornamentation forming a crown at the tip................................................................... Macbrideola ovoidea

3’. Spines with denticulate ornamentation forming a helix at the apex...................................................................................................4

4. Peridium fugacious.............................................................................................................................................................................5

4’. Peridium persistent .............................................................................................................................................................................6

5. On cone-like strobili of Alnus spp. , spores 6–7.5 µm in diam .................................................................... Macbrideola rutilipedata

5’. On galls of Rosaceae , spores 9.5‒11.5 µm in diam ......................................................................................... Macbrideola gallicola

6. On leaf litter, stalk manifest, capillitium creating an external net...................................................... Macbrideola lamprodermoides

6’. On bark of Juniperus spp. , stalk very short, capillitium not creating an external net....................................... Macbrideola brevipes

Figures

FIGURE 3. Macbrideola rutilipedata a. Original drawing of the sporocarps, capillitium, and spores MX 1140 (isotypus), b. Original photograph of a sporocarp with a view of the hollow, red, non-fibrous base of the stalk MX 1140 (isotype), c. Original detail photograph of the sporotheca MX 1140 (isotype), d. Ellipsoid and globose sporocarps B 700100374 (holotype), e. Sporocarp B 700100374 (holotype), f. Detail of the sporotheca B 700100374 (holotype), g. Spores B 700100374 (holotype), h. Sporocarp and the non-fibrous stalk B 700100374 (holotype), i. Detail of the capillitium, columella, and spores B 700100374 (holotype), j–k. Spores B 700100374 (holotype), l. Detail of the spore ornamentation B 700100374 (holotype). Scale bars: d–e = 200 µm, f = 50 µm, g = 10 µm, h = 200 µm, i = 10 µm, j–k = 2 µm, l = 1 µm.

FIGURE 4 Macbrideola rutilipedata a. Sporocarp MM 9116, b. SporocarpAdamonyte 901, c. Detail of the sporotheca Adamonyte 901, d. Columella and capillitium Adamonyte 901, e. Sporocarp Adamonyte 901, f. Detail of the capillitium, columella, and spores Adamonyte 901, g–i. Spores Adamonyte 901, j. Detail of the spore ornamentation Adamonyte 901. Scale bars: a–b = 100 µm, c = 50 µm, d–e = 100 µm, f = 10 µm, g–i = 2 µm, j = 1 µm.